UpSheets can import CSV (Comma Separated Values) files only. Any file you can create or edit using common spreadsheet software can usually be saved in CSV format in just a few clicks. To save a Microsoft Excel spreadsheet as CSV: Choose File> Save As> Format: Comma Separated Values(.csv). Enter a filename and Save the file. To save a Google Sheets spreadsheet as CSV: Choose File> Download as> Comma-separated Values(.csv, current sheet). The file will be downloaded (named after file/sheet name ending in .csv). The files can then be imported and uploaded to Xero by UpSheets.