Photos disappearing from shared album

This is exactly my issue too. My son found my father's old Sony Cybershot and started to take photos.

These photos are now in my Apple Photos app but not wanting to be shared...

Any insight from Apple on this?

Then there is no reason for photos to vanish, unless you are exceeding some of the limits for shared albums: iCloud: My Photo Stream and iCloud Photo Sharing limits

You have checked, if your external drive is compatible with Photos? Move your Photos library to save space on your Mac - Apple Support

That is a big problem. After the upgrade to Ventura you may not even be able to open the library at all on drive with FAT32 format.

I strongly recommend to move your Photos Library to a correctly formatted external drive (or create a separate partition on the same drive formatted MacOS Extended (Journaled) or APFS) and move the Photos Library there. You cannot change the file system format without erasing the drive and losing the data there, so you have to save them temporarily somewhere else to be able to change the file system format.

I have the same problem. I am selecting a number of photos from a folder, and drag them into a shared folder. They appear in the shared folder and after a while - 10-30 seconds - some of them disappear. After finding out which have disappeared, I drag them again to the shared folder and then it seems fine for a while. However, after repeating this process a few times, some of the early uploaded photos are disappearing again.

It is frustrating, because I can't build up my shared album like this and I am under time pressure to share it with others.

Any suggestions are welcome. I am using a MacBook M1 Pro, running Sonoma 14.1.2.

Are you the owner of the shared album?

I have this problem too, I'm not hitting the linked album limit either by a long shot, and I'm uploading compatible file formats. The photos were imported from an external camera.

Did you get anywhere with the problem?

Thanks.