Quick query about image upload limits

A user has a topic with 203 images that they continuously update. They want to add more images but say they can only add 10 more per edit (ie. the value I have for simultaneous uploads setting)

Any ideas why this happens? Is there setting for max images in a post (I can’t seem to find one)?

Can they not upload 10 in one batch, and then another batch of 10 (etc) within the same edit?

They can upload 10 (ie. 1 full batch) but they can’t upload an 11th image without first saving the edit and reopening the edit console