I am using Illustrator 2020 on my personal laptop, saving work to my iCloud to continue working on the files in university.
Recently the files will only open as a .pdf (giving options for pages and not showing all the information) on the university Illustrator CC.

I could in theory Save as- Illustrator CC and presumably that would open okay, but it's annoying to have to do that every time!

On these screenshot Issue 1, you can see the file I'm trying to open (Dinosaur Libby) has a lot of information in the thumbnail, but only opens what's seen in Issue 2. There is only 1 layer, it's all in black.

Why would it only save such a tiny amount of information automatically? Previous versions have never had this issue.

Please help, it's infuriating arriving and being unable to continue on my files!