Rclone Mount: file is edited/updated locally, but not uploaded/replaced in remote

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EDIT:

what really happens is a bit different:

  • go "upstairs" and create a test.docx in the remote, via Microsoft Teams Web interface
  • go "downstairs", open and add a line to test.docx via Rclone (mount), Thunar and LibreOffice.
  • Save changes
  • go back to Microsoft Teams Web: the line that was added downstairs IS VISIBLE upstairs.
  • OK BUT...
  • go back downstairs, try to open again, Libreoffice says file is corrupt!

I cannot understand, by the terminal info what is really happening