Using Bisync with Dropbox while someone adds a file into a watched folder causes a critical error and a resync to be needed. Is this an expected behavior?

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welcome to the forum,

i have never used rclone bisync, but perhaps this will spark an idea or solution.

rclone bisync --check-first

or

  1. rclone mount with --dir-cache-time set to a high value.
  2. pre-warm the vfs dir cache using rclone rc vfs/refresh recursive=true
    so that the mount will only see files currently in the vfs dir cache.
  3. use whatever bisync tool you want.

and fwiw, can learn more about the two vfs caches: