Unable to load any photos to shared album

Hi

Shared albums can only show photos with limited quality - I can't tell you the exact limits right now because the relevant support page seems to be down.

If you want to share full resolution images, you can do it using a shared iCloud drive folder though that will consume your iCloud space that shared albums do not. Also the people will share with will see only the files - they'll have to view them in whatever photo viewing app they have.

The only alternative to that is a third party sharing service such as google photos.

Are you aware that shared albums will only store reduced quality image? You don’t want them to be the main location of any photos you want to keep.

That said - have you first moved the photos from photostream into your library?

I am astonished that you are seeing still 3000 photos in My Photo-stream. My Photo Stream is keeping only up to 1000 photos in iCloud, and only the ones you added during the last thirty days. If you are seeing more than thousand photos, they are buffered locally or you are looking at a custom album, called My Photo Stream, but not at the actual stream. My Photo Stream should be hidden, if you are using iCloud Photos. What is the format of the photos you cannot upload to a shared album? Is it JPEG or a different format?

Can you export one of the Photos that you cannot share to the shared album to your Desktop?