File missing from mount visible with rclone ls

that is correct and expected behavior.

  1. uloz is not a polling remote, a debug log should show that poll-interval is not supported by this remote.
    whereas, dropbox is a polling remote.
  2. changes made directly on the cloud storage by the web interface or a different copy of rclone will only be picked up once the directory cache expires if the backend configured does not support polling for changes

for uloz, rclone mount will not notice changes for 12 hours.

  1. rclone rc vfs/refresh recursive=true
  2. run plex scan

and can check out my summary of the two rclone vfs caches

@kapitainsky, i do not use combine remotes much and never with mount.
could dir= be used just on uloz, something like
rclone rc vfs/refresh recursive=true dir=Movies
or
rclone rc vfs/refresh recursive=true dir=uloz-crypt:/Movies