gs_upload: Upload a file and convert it to a Google Sheet
Description
Google supports the following file types to be converted to a Google
spreadsheet: .xls, .xlsx, .csv, .tsv, .txt, .tab, .xlsm, .xlt, .xltx, .xltm,
.ods. The newly uploaded file will appear in your Google Sheets home screen.
This function calls the
Google Drive API.