diff --git a/Cargo.toml b/Cargo.toml
index 4b29ddd9d..eb6b4dc7d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -204,6 +204,8 @@ png = "0.18"
 qrcode = { version = "0.14", default-features = false }
 
 # Excel/Spreadsheet Support - MS Office 100% Compatibility
+# umya-spreadsheet preserves: Charts, styles, images, formulas, macros, comments
+umya-spreadsheet = "2.3"
 calamine = "0.26"
 rust_xlsxwriter = "0.79"
 spreadsheet-ods = "1.0"
diff --git a/src/sheet/storage.rs b/src/sheet/storage.rs
index 29a421d39..44da4c78d 100644
--- a/src/sheet/storage.rs
+++ b/src/sheet/storage.rs
@@ -1,11 +1,10 @@
 use crate::shared::state::AppState;
-use crate::sheet::types::{CellData, Spreadsheet, SpreadsheetMetadata, Worksheet};
-use calamine::{Data, Reader, Xlsx};
+use crate::sheet::types::{CellData, CellStyle, MergedCell, Spreadsheet, SpreadsheetMetadata, Worksheet};
 use chrono::Utc;
-use rust_xlsxwriter::{Workbook, Format};
 use std::collections::HashMap;
 use std::io::Cursor;
 use std::sync::Arc;
+use umya_spreadsheet::Spreadsheet as UmyaSpreadsheet;
 use uuid::Uuid;
 
 pub fn get_user_sheets_path(user_id: &str) -> String {
@@ -80,11 +79,16 @@ pub async fn save_sheet_as_xlsx(
 }
 
 pub fn convert_to_xlsx(sheet: &Spreadsheet) -> Result<Vec<u8>, String> {
-    let mut workbook = Workbook::new();
+    let mut workbook = umya_spreadsheet::new_file();
 
-    for worksheet in &sheet.worksheets {
-        let ws = workbook.add_worksheet();
-        ws.set_name(&worksheet.name).map_err(|e| format!("Failed to set sheet name: {e}"))?;
+    for (ws_idx, worksheet) in sheet.worksheets.iter().enumerate() {
+        let umya_sheet = if ws_idx == 0 {
+            workbook.get_sheet_mut(&0).ok_or("Failed to get first sheet")?
+        } else {
+            workbook.new_sheet(&worksheet.name).map_err(|e| format!("Failed to create sheet: {e}"))?
+        };
+
+        umya_sheet.set_name(&worksheet.name);
 
         for (key, cell_data) in &worksheet.data {
             let parts: Vec<&str> = key.split(',').collect();
@@ -92,81 +96,175 @@ pub fn convert_to_xlsx(sheet: &Spreadsheet) -> Result<Vec<u8>, String> {
                 continue;
             }
 
-            let row: u32 = parts[0].parse().unwrap_or(0);
-            let col: u16 = parts[1].parse().unwrap_or(0);
+            let row: u32 = parts[0].parse().unwrap_or(0) + 1;
+            let col: u32 = parts[1].parse().unwrap_or(0) + 1;
 
-            let mut format = Format::new();
-
-            if let Some(style) = &cell_data.style {
-                if let Some(ref weight) = style.font_weight {
-                    if weight == "bold" {
-                        format = format.set_bold();
-                    }
-                }
-                if let Some(ref font_style) = style.font_style {
-                    if font_style == "italic" {
-                        format = format.set_italic();
-                    }
-                }
-                if let Some(size) = style.font_size {
-                    format = format.set_font_size(size as f64);
-                }
-                if let Some(ref font) = style.font_family {
-                    format = format.set_font_name(font);
-                }
+            if row == 0 || col == 0 {
+                continue;
             }
 
+            let cell = umya_sheet.get_cell_mut((col, row));
+
             if let Some(ref formula) = cell_data.formula {
                 let formula_str = if formula.starts_with('=') {
                     &formula[1..]
                 } else {
-                    formula
+                    formula.as_str()
                 };
-                let _ = ws.write_formula_with_format(row, col, formula_str, &format);
+                cell.set_formula(formula_str);
             } else if let Some(ref value) = cell_data.value {
                 if let Ok(num) = value.parse::<f64>() {
-                    let _ = ws.write_number_with_format(row, col, num, &format);
+                    cell.set_value_number(num);
+                } else if value.eq_ignore_ascii_case("true") || value.eq_ignore_ascii_case("false") {
+                    cell.set_value_bool(value.eq_ignore_ascii_case("true"));
                 } else {
-                    let _ = ws.write_string_with_format(row, col, value, &format);
+                    cell.set_value_string(value);
+                }
+            }
+
+            if let Some(ref style) = cell_data.style {
+                apply_umya_style(cell, style);
+            }
+        }
+
+        if let Some(ref widths) = worksheet.column_widths {
+            for (col_idx, width) in widths {
+                let col_letter = get_col_letter(*col_idx);
+                if let Some(col_dim) = umya_sheet.get_column_dimension_mut(&col_letter) {
+                    col_dim.set_width(*width as f64);
                 }
             }
         }
 
-        if let Some(widths) = &worksheet.column_widths {
-            for (col_idx, width) in widths {
-                let _ = ws.set_column_width(*col_idx as u16, *width as f64);
-            }
-        }
-
-        if let Some(heights) = &worksheet.row_heights {
+        if let Some(ref heights) = worksheet.row_heights {
             for (row_idx, height) in heights {
-                let _ = ws.set_row_height(*row_idx, *height as f64);
+                if let Some(row_dim) = umya_sheet.get_row_dimension_mut(row_idx) {
+                    row_dim.set_height(*height as f64);
+                }
             }
         }
 
-        if let Some(merged) = &worksheet.merged_cells {
+        if let Some(ref merged) = worksheet.merged_cells {
             for merge in merged {
-                let _ = ws.merge_range(
-                    merge.start_row,
-                    merge.start_col as u16,
-                    merge.end_row,
-                    merge.end_col as u16,
-                    "",
-                    &Format::new(),
-                );
+                let start_col = get_col_letter(merge.start_col + 1);
+                let end_col = get_col_letter(merge.end_col + 1);
+                let range = format!("{}{}:{}{}", start_col, merge.start_row + 1, end_col, merge.end_row + 1);
+                let _ = umya_sheet.add_merge_cells(&range);
+            }
+        }
+
+        if let Some(frozen_rows) = worksheet.frozen_rows {
+            if frozen_rows > 0 {
+                let sheet_views = umya_sheet.get_sheet_views_mut();
+                if let Some(view) = sheet_views.get_sheet_view_list_mut().first_mut() {
+                    let pane = view.get_pane_mut();
+                    pane.set_y_split(frozen_rows as f64);
+                    pane.set_state(umya_spreadsheet::structs::PaneStateValues::Frozen);
+                }
+            }
+        }
+
+        if let Some(frozen_cols) = worksheet.frozen_cols {
+            if frozen_cols > 0 {
+                let sheet_views = umya_sheet.get_sheet_views_mut();
+                if let Some(view) = sheet_views.get_sheet_view_list_mut().first_mut() {
+                    let pane = view.get_pane_mut();
+                    pane.set_x_split(frozen_cols as f64);
+                    pane.set_state(umya_spreadsheet::structs::PaneStateValues::Frozen);
+                }
             }
         }
     }
 
-    let buf = workbook.save_to_buffer().map_err(|e| format!("Failed to write xlsx: {e}"))?;
-    Ok(buf)
+    let mut buf = Cursor::new(Vec::new());
+    umya_spreadsheet::writer::xlsx::write_writer(&workbook, &mut buf)
+        .map_err(|e| format!("Failed to write xlsx: {e}"))?;
+
+    Ok(buf.into_inner())
+}
+
+fn apply_umya_style(cell: &mut umya_spreadsheet::Cell, style: &CellStyle) {
+    let cell_style = cell.get_style_mut();
+
+    if let Some(ref weight) = style.font_weight {
+        if weight == "bold" {
+            cell_style.get_font_mut().set_bold(true);
+        }
+    }
+
+    if let Some(ref font_style) = style.font_style {
+        if font_style == "italic" {
+            cell_style.get_font_mut().set_italic(true);
+        }
+    }
+
+    if let Some(ref decoration) = style.text_decoration {
+        if decoration.contains("underline") {
+            cell_style.get_font_mut().set_underline("single");
+        }
+        if decoration.contains("line-through") {
+            cell_style.get_font_mut().set_strikethrough(true);
+        }
+    }
+
+    if let Some(size) = style.font_size {
+        cell_style.get_font_mut().set_size(size as f64);
+    }
+
+    if let Some(ref font) = style.font_family {
+        cell_style.get_font_mut().set_name(font);
+    }
+
+    if let Some(ref color) = style.color {
+        let color_str = color.trim_start_matches('#');
+        cell_style.get_font_mut().get_color_mut().set_argb(&format!("FF{color_str}"));
+    }
+
+    if let Some(ref bg) = style.background {
+        let bg_str = bg.trim_start_matches('#');
+        cell_style.get_fill_mut().get_pattern_fill_mut()
+            .get_foreground_color_mut().set_argb(&format!("FF{bg_str}"));
+        cell_style.get_fill_mut().get_pattern_fill_mut()
+            .set_pattern_type(umya_spreadsheet::structs::PatternValues::Solid);
+    }
+
+    if let Some(ref align) = style.text_align {
+        let h_align = match align.as_str() {
+            "left" => umya_spreadsheet::structs::HorizontalAlignmentValues::Left,
+            "center" => umya_spreadsheet::structs::HorizontalAlignmentValues::Center,
+            "right" => umya_spreadsheet::structs::HorizontalAlignmentValues::Right,
+            _ => umya_spreadsheet::structs::HorizontalAlignmentValues::Left,
+        };
+        cell_style.get_alignment_mut().set_horizontal(h_align);
+    }
+
+    if let Some(ref v_align) = style.vertical_align {
+        let v = match v_align.as_str() {
+            "top" => umya_spreadsheet::structs::VerticalAlignmentValues::Top,
+            "middle" => umya_spreadsheet::structs::VerticalAlignmentValues::Center,
+            "bottom" => umya_spreadsheet::structs::VerticalAlignmentValues::Bottom,
+            _ => umya_spreadsheet::structs::VerticalAlignmentValues::Center,
+        };
+        cell_style.get_alignment_mut().set_vertical(v);
+    }
+}
+
+fn get_col_letter(col: u32) -> String {
+    let mut result = String::new();
+    let mut n = col;
+    while n > 0 {
+        n -= 1;
+        result.insert(0, (b'A' + (n % 26) as u8) as char);
+        n /= 26;
+    }
+    result
 }
 
 pub async fn load_xlsx_from_drive(
     state: &Arc<AppState>,
-    _user_id: &str,
+    user_id: &str,
     file_path: &str,
-) -> Result<Spreadsheet, String> {
+) -> Result<(Spreadsheet, UmyaSpreadsheet), String> {
     let drive = state
         .drive
         .as_ref()
@@ -187,10 +285,18 @@ pub async fn load_xlsx_from_drive(
         .map_err(|e| format!("Failed to read file: {e}"))?
         .into_bytes();
 
-    load_xlsx_from_bytes(&bytes, file_path)
+    load_xlsx_from_bytes(&bytes, user_id, file_path)
 }
 
-pub fn load_xlsx_from_bytes(bytes: &[u8], file_path: &str) -> Result<Spreadsheet, String> {
+pub fn load_xlsx_from_bytes(
+    bytes: &[u8],
+    user_id: &str,
+    file_path: &str,
+) -> Result<(Spreadsheet, UmyaSpreadsheet), String> {
+    let cursor = Cursor::new(bytes);
+    let workbook = umya_spreadsheet::reader::xlsx::read_reader(cursor, true)
+        .map_err(|e| format!("Failed to parse xlsx: {e}"))?;
+
     let file_name = file_path
         .split('/')
         .last()
@@ -199,18 +305,302 @@ pub fn load_xlsx_from_bytes(bytes: &[u8], file_path: &str) -> Result<Spreadsheet
         .trim_end_matches(".xlsm")
         .trim_end_matches(".xls");
 
-    let worksheets = parse_excel_to_worksheets(bytes, "xlsx")?;
+    let mut worksheets = Vec::new();
 
-    Ok(Spreadsheet {
+    for sheet in workbook.get_sheet_collection() {
+        let mut data: HashMap<String, CellData> = HashMap::new();
+        let mut column_widths: HashMap<u32, u32> = HashMap::new();
+        let mut row_heights: HashMap<u32, u32> = HashMap::new();
+
+        let (max_col, max_row) = sheet.get_highest_column_and_row();
+
+        for row in 1..=max_row {
+            for col in 1..=max_col {
+                if let Some(cell) = sheet.get_cell((col, row)) {
+                    let value = cell.get_value().to_string();
+                    let formula = if cell.get_formula().is_empty() {
+                        None
+                    } else {
+                        Some(format!("={}", cell.get_formula()))
+                    };
+
+                    if value.is_empty() && formula.is_none() {
+                        continue;
+                    }
+
+                    let key = format!("{},{}", row - 1, col - 1);
+                    let style = extract_cell_style(cell);
+
+                    let note = sheet.get_comments()
+                        .iter()
+                        .find(|c| {
+                            let coord = c.get_coordinate();
+                            coord.get_col_num() == &col && coord.get_row_num() == &row
+                        })
+                        .map(|c| c.get_text().get_value().to_string());
+
+                    data.insert(
+                        key,
+                        CellData {
+                            value: if value.is_empty() { None } else { Some(value) },
+                            formula,
+                            style,
+                            format: None,
+                            note,
+                        },
+                    );
+                }
+            }
+        }
+
+        for col in 1..=max_col {
+            let col_letter = get_col_letter(col);
+            if let Some(dim) = sheet.get_column_dimension(&col_letter) {
+                if let Some(width) = dim.get_width() {
+                    column_widths.insert(col, width.round() as u32);
+                }
+            }
+        }
+
+        for row in 1..=max_row {
+            if let Some(dim) = sheet.get_row_dimension(&row) {
+                if let Some(height) = dim.get_height() {
+                    row_heights.insert(row, height.round() as u32);
+                }
+            }
+        }
+
+        let merged_cells: Vec<MergedCell> = sheet.get_merge_cells()
+            .iter()
+            .filter_map(|mc| {
+                let range = mc.get_range().get_range();
+                parse_merge_range(&range)
+            })
+            .collect();
+
+        let frozen_rows = sheet.get_sheet_views()
+            .get_sheet_view_list()
+            .first()
+            .and_then(|v| v.get_pane().get_y_split())
+            .map(|y| y as u32);
+
+        let frozen_cols = sheet.get_sheet_views()
+            .get_sheet_view_list()
+            .first()
+            .and_then(|v| v.get_pane().get_x_split())
+            .map(|x| x as u32);
+
+        worksheets.push(Worksheet {
+            name: sheet.get_name().to_string(),
+            data,
+            column_widths: if column_widths.is_empty() { None } else { Some(column_widths) },
+            row_heights: if row_heights.is_empty() { None } else { Some(row_heights) },
+            frozen_rows,
+            frozen_cols,
+            merged_cells: if merged_cells.is_empty() { None } else { Some(merged_cells) },
+            filters: None,
+            hidden_rows: None,
+            validations: None,
+            conditional_formats: None,
+            charts: None,
+        });
+    }
+
+    let spreadsheet = Spreadsheet {
         id: Uuid::new_v4().to_string(),
         name: file_name.to_string(),
-        owner_id: get_current_user_id(),
+        owner_id: user_id.to_string(),
         worksheets,
         created_at: Utc::now(),
         updated_at: Utc::now(),
+    };
+
+    Ok((spreadsheet, workbook))
+}
+
+fn extract_cell_style(cell: &umya_spreadsheet::Cell) -> Option<CellStyle> {
+    let style = cell.get_style();
+    let font = style.get_font();
+    let fill = style.get_fill();
+    let alignment = style.get_alignment();
+
+    let font_weight = if font.get_bold() { Some("bold".to_string()) } else { None };
+    let font_style = if font.get_italic() { Some("italic".to_string()) } else { None };
+
+    let underline = font.get_underline();
+    let strikethrough = font.get_strikethrough();
+    let text_decoration = if underline != "none" || strikethrough {
+        let mut dec = Vec::new();
+        if underline != "none" {
+            dec.push("underline");
+        }
+        if strikethrough {
+            dec.push("line-through");
+        }
+        Some(dec.join(" "))
+    } else {
+        None
+    };
+
+    let font_size = Some(font.get_size().round() as u32);
+    let font_family = Some(font.get_name().to_string());
+
+    let color = font.get_color().get_argb().map(|c| {
+        let s = c.to_string();
+        if s.len() >= 8 {
+            format!("#{}", &s[2..])
+        } else {
+            format!("#{s}")
+        }
+    });
+
+    let background = fill.get_pattern_fill().get_foreground_color().get_argb().map(|c| {
+        let s = c.to_string();
+        if s.len() >= 8 {
+            format!("#{}", &s[2..])
+        } else {
+            format!("#{s}")
+        }
+    });
+
+    let text_align = match alignment.get_horizontal().to_string().as_str() {
+        "left" => Some("left".to_string()),
+        "center" => Some("center".to_string()),
+        "right" => Some("right".to_string()),
+        _ => None,
+    };
+
+    let vertical_align = match alignment.get_vertical().to_string().as_str() {
+        "top" => Some("top".to_string()),
+        "center" => Some("middle".to_string()),
+        "bottom" => Some("bottom".to_string()),
+        _ => None,
+    };
+
+    if font_weight.is_some() || font_style.is_some() || text_decoration.is_some()
+        || color.is_some() || background.is_some() || text_align.is_some() {
+        Some(CellStyle {
+            font_family,
+            font_size,
+            font_weight,
+            font_style,
+            text_decoration,
+            color,
+            background,
+            text_align,
+            vertical_align,
+            border: None,
+        })
+    } else {
+        None
+    }
+}
+
+fn parse_merge_range(range: &str) -> Option<MergedCell> {
+    let parts: Vec<&str> = range.split(':').collect();
+    if parts.len() != 2 {
+        return None;
+    }
+
+    let start = parse_cell_ref(parts[0])?;
+    let end = parse_cell_ref(parts[1])?;
+
+    Some(MergedCell {
+        start_row: start.0,
+        start_col: start.1,
+        end_row: end.0,
+        end_col: end.1,
     })
 }
 
+fn parse_cell_ref(cell_ref: &str) -> Option<(u32, u32)> {
+    let mut col_str = String::new();
+    let mut row_str = String::new();
+
+    for c in cell_ref.chars() {
+        if c.is_ascii_alphabetic() {
+            col_str.push(c.to_ascii_uppercase());
+        } else if c.is_ascii_digit() {
+            row_str.push(c);
+        }
+    }
+
+    let col = col_str.chars().fold(0u32, |acc, c| {
+        acc * 26 + (c as u32 - 'A' as u32 + 1)
+    });
+
+    let row: u32 = row_str.parse().ok()?;
+
+    Some((row.saturating_sub(1), col.saturating_sub(1)))
+}
+
+pub async fn update_xlsx_cell(
+    workbook: &mut UmyaSpreadsheet,
+    sheet_name: &str,
+    row: u32,
+    col: u32,
+    value: Option<&str>,
+    formula: Option<&str>,
+    style: Option<&CellStyle>,
+) -> Result<(), String> {
+    let sheet = workbook
+        .get_sheet_by_name_mut(sheet_name)
+        .ok_or_else(|| format!("Sheet '{sheet_name}' not found"))?;
+
+    let cell = sheet.get_cell_mut((col + 1, row + 1));
+
+    if let Some(f) = formula {
+        let formula_str = if f.starts_with('=') { &f[1..] } else { f };
+        cell.set_formula(formula_str);
+    } else if let Some(v) = value {
+        if let Ok(num) = v.parse::<f64>() {
+            cell.set_value_number(num);
+        } else if v.eq_ignore_ascii_case("true") || v.eq_ignore_ascii_case("false") {
+            cell.set_value_bool(v.eq_ignore_ascii_case("true"));
+        } else {
+            cell.set_value_string(v);
+        }
+    } else {
+        cell.set_value_string("");
+    }
+
+    if let Some(s) = style {
+        apply_umya_style(cell, s);
+    }
+
+    Ok(())
+}
+
+pub async fn save_workbook_to_drive(
+    state: &Arc<AppState>,
+    user_id: &str,
+    sheet_id: &str,
+    workbook: &UmyaSpreadsheet,
+) -> Result<(), String> {
+    let drive = state
+        .drive
+        .as_ref()
+        .ok_or_else(|| "Drive not available".to_string())?;
+
+    let path = format!("{}/{}.xlsx", get_user_sheets_path(user_id), sheet_id);
+
+    let mut buf = Cursor::new(Vec::new());
+    umya_spreadsheet::writer::xlsx::write_writer(workbook, &mut buf)
+        .map_err(|e| format!("Failed to write xlsx: {e}"))?;
+
+    drive
+        .put_object()
+        .bucket("gbo")
+        .key(&path)
+        .body(buf.into_inner().into())
+        .content_type("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
+        .send()
+        .await
+        .map_err(|e| format!("Failed to save xlsx: {e}"))?;
+
+    Ok(())
+}
+
 pub async fn load_sheet_from_drive(
     state: &Arc<AppState>,
     user_id: &str,
@@ -410,70 +800,70 @@ pub fn parse_csv_to_worksheets(
     }])
 }
 
-pub fn parse_excel_to_worksheets(bytes: &[u8], _ext: &str) -> Result<Vec<Worksheet>, String> {
-    let cursor = Cursor::new(bytes);
-    let mut workbook: Xlsx<_> =
-        Reader::new(cursor).map_err(|e| format!("Failed to parse spreadsheet: {e}"))?;
+pub fn parse_excel_to_worksheets(bytes: &[u8], ext: &str) -> Result<Vec<Worksheet>, String> {
+    if ext == "xlsx" || ext == "xlsm" || ext == "xls" {
+        let cursor = Cursor::new(bytes);
+        if let Ok(workbook) = umya_spreadsheet::reader::xlsx::read_reader(cursor, true) {
+            let mut worksheets = Vec::new();
 
-    let sheet_names: Vec<String> = workbook.sheet_names().to_vec();
-    let mut worksheets = Vec::new();
+            for sheet in workbook.get_sheet_collection() {
+                let mut data: HashMap<String, CellData> = HashMap::new();
+                let (max_col, max_row) = sheet.get_highest_column_and_row();
 
-    for sheet_name in sheet_names {
-        let range = workbook
-            .worksheet_range(&sheet_name)
-            .map_err(|e| format!("Failed to read sheet {sheet_name}: {e}"))?;
+                for row in 1..=max_row {
+                    for col in 1..=max_col {
+                        if let Some(cell) = sheet.get_cell((col, row)) {
+                            let value = cell.get_value().to_string();
+                            let formula = if cell.get_formula().is_empty() {
+                                None
+                            } else {
+                                Some(format!("={}", cell.get_formula()))
+                            };
 
-        let mut data: HashMap<String, CellData> = HashMap::new();
+                            if value.is_empty() && formula.is_none() {
+                                continue;
+                            }
 
-        for (row_idx, row) in range.rows().enumerate() {
-            for (col_idx, cell) in row.iter().enumerate() {
-                let value = match cell {
-                    Data::Empty => continue,
-                    Data::String(s) => s.clone(),
-                    Data::Int(i) => i.to_string(),
-                    Data::Float(f) => f.to_string(),
-                    Data::Bool(b) => b.to_string(),
-                    Data::DateTime(dt) => dt.to_string(),
-                    Data::Error(e) => format!("#ERR:{e:?}"),
-                    Data::DateTimeIso(s) => s.clone(),
-                    Data::DurationIso(s) => s.clone(),
-                };
+                            let key = format!("{},{}", row - 1, col - 1);
+                            let style = extract_cell_style(cell);
 
-                let key = format!("{row_idx},{col_idx}");
-                data.insert(
-                    key,
-                    CellData {
-                        value: Some(value),
-                        formula: None,
-                        style: None,
-                        format: None,
-                        note: None,
-                    },
-                );
+                            data.insert(
+                                key,
+                                CellData {
+                                    value: if value.is_empty() { None } else { Some(value) },
+                                    formula,
+                                    style,
+                                    format: None,
+                                    note: None,
+                                },
+                            );
+                        }
+                    }
+                }
+
+                worksheets.push(Worksheet {
+                    name: sheet.get_name().to_string(),
+                    data,
+                    column_widths: None,
+                    row_heights: None,
+                    frozen_rows: None,
+                    frozen_cols: None,
+                    merged_cells: None,
+                    filters: None,
+                    hidden_rows: None,
+                    validations: None,
+                    conditional_formats: None,
+                    charts: None,
+                });
+            }
+
+            if !worksheets.is_empty() {
+                return Ok(worksheets);
             }
         }
-
-        worksheets.push(Worksheet {
-            name: sheet_name,
-            data,
-            column_widths: None,
-            row_heights: None,
-            frozen_rows: None,
-            frozen_cols: None,
-            merged_cells: None,
-            filters: None,
-            hidden_rows: None,
-            validations: None,
-            conditional_formats: None,
-            charts: None,
-        });
     }
 
-    if worksheets.is_empty() {
-        return Err("Spreadsheet has no sheets".to_string());
-    }
-
-    Ok(worksheets)
+    Err("Failed to parse spreadsheet".to_string())
 }
 
 pub fn create_new_spreadsheet() -> Spreadsheet {