I've been faithfully using Lightroom Classic since the first release. I'm a semi-professional photographer with a very large Library... sitting at 749,311 photos, and at present I've got 708,590 of them synced. It's important to my workflow that I'm able to access them from Lightroom (the Cloud version) while mobile on multiple other devices, away from my main home studio network. I tend to only do the majority of my actual final edits on Lightroom Classic on my main edit system at my studio, however it's important to be able to pull up Collections/Albums while I'm on the road or on shooting trips, and at least be able to continue with selects, culling, rating, flagging, and making new Albums while away from my studio system. I'm also an extensive user of the People view (for facial recognition) of all of the photos that I use in Lightroom while mobile, and have spent many hours training that facial recognition and identifying faces and naming people. I do not use the People feature within Lightroom Classic, as that isn't an effective workflow and does not have the power of People in Lightroom.
However, my issue is that i've been troubleshooting stuck syncs, for at least the past couple of years. I've never been able to get it down to zero images left to sync.
At the moment, my LR Classic sync is oscillating up and down between a couple of numbers of images to be synced. I recently imported some shots from a couple of shoots into my main library, so it's trying to push another couple of thousand images up from LR Classic through the sync. At this moment there are 3,086 photos to sync, but that number has dropped down as low as about 1,200 before bouncing back up to around 3,000 again repeatedly in an annoyingly looping cycle. I'm making no further changes/edits that would keep it needing to re-sync the same files over and over again.
Main main edit system at my studio is running Microsoft Windows [Version 10.0.19043.1237], I have the library on a local NVMe SSD, and all my RAW/DNG files on a networked QNAP NAS. It is running Lightroom Classic 10.4 Build [202108071231-af9219b9] today. My road laptop has all SSD storage as well and is also running Microsoft Windows [Version 10.0.19043.1237], with Lightroom v4.4 Build [20210805-0652-b84a95f] to access my synced collections/albums.
In terms of what I've tried to get my sync to complete... basically I've tried every trick or suggestion that I've ever seen you all post in these forums and support community here.
I've tried going in to the Sync Activity view in the Preference menus in order to see which files it seems hung up on now. I'll jump into those files on either my main library, or sometimes on the synced album and make mild changes to the files in question such as changing ratings or flags, in order to give the system a new data change to sync. Occasionally that seems to get it a bit unstuck, but that's doing nothing for me right now. Although for reasons I've never been able to understand, when I mouse over the Cloud icon in the top right showing syncing activity, it will say something like "Syncing 3,145 photos" (which it says right now), but then I'll click the cog to hop over to the Preferences window, and check the Sync Activity window and it will just say "No sync activities" with (0 Uploading, 0 Downloading, 0 Pending) shown. If I exit out and back in to Preference, or possibly pause and resume syncing, the next time it might show some activity under Sync Activity, or it might not. My point being that the display under sync activity frequently doesn't agree with the mouseover status of the cloud icon when it comes to what syncing is supposedly currently occuring.
My sync count had gotten down to about 118 syncs remaining recently, but it was really frustrating me that it finally got stuck there, so having read the recommendation in so many posts, I finally held down Alt and hit the "Rebuild Sync Data" button. I had to wait several hours as it needed to resync over 700,000 photos, and when it finally came towards conclusion, it reaches a number closer to 2,000 files remaining to sync. So it made my annoying problem even worse. No improvement there.
I've also read of people being recommended or trying to "Delete All Synced Data". I had done that a couple of years ago when I wanted to try a reset to see if I could make this better. However, since putting many, many hours of tagging people into the People section of Lightroom (cloud), I now have zero interest in trying to "Delete All Synced Data" since it would lose all of that People tagging work, and since that information doesn't sync back to Lightroom Classic on my main Library, there would be no way to preserve that information (I'd just love if you all could change that and allow those face tags to propagate back to my LR Classic library as metadata tags).
I'm at a loss as to what I can do myself to get all my syncs completed and keep them completed in the future. I'm glad to take any recommendations or advice you'd offer, or Generate Diagnostic Report and send it to you, if that would be helpful. Thank you.
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