I'm also facing the same issue on PC, but it seems all right on my iPad. Have you figured out how to solve the problem?
Hope you have a wonderful day!
I also find uploading files from phone is much faster, but desktop app just takes forever. Still no solution, it seems to hang on certain files and not move forward for a long time. Still taking forever to upload my collections to the cloud, and Adobe don't seem to care. Very disappointing.
I have the same problem, I can see the photos in Lightroom CC on my PC, but it's still sync, so in my IPad I can only see a few of them. There is something to do to increase the speed of the sync? I have 21.571 files and in 24 hours it just manage to sync 690.
"it seems to hang on certain files and not move forward for a long time" agree, today when I arrived at home it was in the same sync number.
Thanks for your help