fix: handle spaces in Excel SaveAs paths and add file verification

SharePointFunctions.ps1

@@ -469,7 +469,10 @@ function Convert-Files {
 
             # Convert the file to XLSX
             $xlsxFileName = $originalFileName -replace "\.xls[m]?$", ".xlsx"
-            $xlsxPath = "$env:TEMP\$xlsxFileName"
+            # Use Join-Path to properly handle paths with spaces
+            $xlsxPath = Join-Path $env:TEMP $xlsxFileName
+            $downloadPath = Join-Path $env:TEMP $originalFileName
+
             try {
                 # Open Excel
                 $excel = New-Object -ComObject Excel.Application
@@ -479,9 +482,14 @@ function Convert-Files {
                 try {
                     $workbook = $excel.Workbooks.Open($downloadPath)
                     
-                    # Save as XLSX
-                    $workbook.SaveAs($xlsxPath, 51)  # 51 = xlOpenXMLWorkbook (*.xlsx)
+                    # Save as XLSX - use the full path with quotes
+                    $workbook.SaveAs([string]$xlsxPath, 51)  # 51 = xlOpenXMLWorkbook (*.xlsx)
                     $workbook.Close($false)
+                    
+                    # Verify the file was created
+                    if (-not (Test-Path $xlsxPath)) {
+                        throw "Excel SaveAs succeeded but file not found at: $xlsxPath"
+                    }
                 }
                 finally {
                     # Proper cleanup of Excel COM objects
@@ -495,6 +503,33 @@ function Convert-Files {
                 }
                 
                 $script:txtStatus.Text += "Successfully converted to: $xlsxFileName`n"
+                
+                # Upload the converted file to SharePoint
+                try {
+                    # Verify file exists before trying to read it
+                    if (-not (Test-Path $xlsxPath)) {
+                        throw "Converted file not found at: $xlsxPath"
+                    }
+                    
+                    # Get the destination folder
+                    $destinationFolder = $script:txtTempLib.Text
+                    $uploadUri = "https://graph.microsoft.com/v1.0/drives/$($drive.Id)/root:/$($destinationFolder)/$($xlsxFileName):/content"
+                    
+                    # Read the file content
+                    $fileContent = [System.IO.File]::ReadAllBytes($xlsxPath)
+                    
+                    # Upload the file
+                    Invoke-MgGraphRequest -Uri $uploadUri -Method PUT -Body $fileContent -ContentType "application/octet-stream"
+                    
+                    $script:txtStatus.Text += "Successfully uploaded to SharePoint: $destinationFolder/$xlsxFileName`n"
+                }
+                catch {
+                    $script:txtStatus.Text += "Error uploading file: $($_.Exception.Message)`n"
+                    if (-not (Test-Path $xlsxPath)) {
+                        $script:txtStatus.Text += "File not found at: $xlsxPath`n"
+                    }
+                    continue # Move to the next file
+                }
             }
             catch {
                 $script:txtStatus.Text += "Error converting file: $($_.Exception.Message)`n"