Could you please send me a LR Desktop diagnostic log - best as a private message with a downloadable dropbox link.
You can trigger the log via LR Desktop preferences -> Lightroom Mobile and when you hold down the alt key you will notice a generate diagnostic log button. - Guido
Many thanks - very kind of you! Have triggered a log and will upload it to Wetransfer and send you a link - if this is good for you? Not quite sure if you only want the lrsync_log.html file or more files? GreatBe you'll take a look - much appreciated!
Thanks Greule for very helpful support! The solution you provided solved my problem! Much appreciated! Here's Geule's solution if anyone else encounters my problem:
Remove the sync.lrdata file and restart Lr Desktop (Lr). This would restart/refresh the sync (metadata only).
Removing the Sync.lrdata might fix whatever the issue is.
You can find the sync.lrdata file here:
On Mac it's at /Users/<user>/Library/Caches/Adobe/Lightroom/Sync Data/Sync.lrdata