Another situation with photos stuck uploading

Hi there,

I got a new computer after a couple of years of exclusively using Lr mobile or on the iPad.

Since my cloud quota was quite full, I’m in the process of syncing all my photos from the cloud down to LrC. The plan is to take the photos synced down out of ‘All synced photographs’, then put them back in order to upload only the smart previews. I’ve seen a lot of users do this successfully! However, for any photos in which I’ve tried this process (I’ve attempted this with very small batches before committing to all my photos) the sync process gets stuck at uploading.

Please note:

• If I’m importing brand new images into the catalog and into ‘All synced photographs’, putting them into a collection or not, the syncing behaves as it should.
• There is no items pending sync in any other devices, and no items in the ‘sync errors’ folder in Lr web.
• I have updated LrC to the latest version.

I’m really at a loss here and will appreciate any help.

Thanks in advance!