I’m in the same boat as all of you. It’s so frustrating and incredibly pathetic that these issues haven't been resolved. Uploading 7 photos today took me over an hour! My home internet is extremely fast and Squarespace is the only website that gives me issues. Really testing my patience.
I have to use my laptop to upload photos because uploading photos via my iPad (which I would prefer to use) or iPhone take excruciatingly long. I also cannot rearrange my photos! Something that takes me seconds on other websites is seemingly impossible with Squarespace.