XLSX from Gmail to Google Sheets: invalid mime type. Content type seems to be application/octet?

Question

I\'m trying to import an xlsx file from a Gmail Attachment to Google Drive (as Google Sheet) using Google Apps Script. I\'ve tried using the Advanced Drive API in GAS, but doing

Answer 1

These

parents: [{id: folderId}],
mimeType: MimeType.GOOGLE_SHEETS

refer to the input file. See docs here. You should skip these.

This snippet worked for me with Google Drive API v2:

function abc() {
  var mail = GmailApp.search("SEARCH_TERM")[0];
  var msg = mail.getMessages()[0];
  var blob = msg.getAttachments()[0];
  var file = {
    title: 'Converted Spreadsheet'
  };
  Drive.Files.insert(file, blob, {convert: true});
}