I don't know if this has been resolved for anyone else, but I'm running into the exact same problem.
After updating Adobe CC to v5.7.01307, as well as all other apps I use (Illustrator v26.2.1, Photoshop, InDesign), my entire library collection has disappeared, leaving me with just the message "To use Creative Cloud libraries, please sign in to Creative Cloud", even though I am signed in to my CC account. All my apps work fine, except for my missing Library. Any suggestions?
I tried signing out and back in again through the Help menu, as well as through the CC app., and I restarted my Mac several times.
I'm currently running MacOS v12.2.1 (Monterey) on a Mac Mini M1, 1TB HDD, 16GB RAM.
Let me know if you need any more information to make the right assessment.
Thanks kglad for the helpful tip. And sorry for the extreme delay in my reply.
Unfortunately, this did not solve my problem, so I'll just start recreating a new library from scratch. Only, this time I'll create a backup AI file that will hold my assets in case this happens again.
personally, i wouldn't trust any "cloud" back up for anything important. it's so inexpensive (but there are some bad choices if it's too inexpensive) to purchase an external hard drive (i just checked amazon and sorted by customer ratings), i recommend using that for backing up important files.
cloud storage is best used for short-term convenience (imo). and by convenience i mean to easily and quickly get files from one device to another. after moving files, it should only be a minor inconvenience if the cloud file(s) are lost.
if it's anything more than a minor inconvenience if cloud files are lost, i think you're making an mistake.