Is the 100MB upload space limit overall or per file?

when you sat that free users max file upload space is 100MB - do you mean overall or per file (photo)?

Although I have answered this on the other thread, you can still read my answer below.

It is overall. The 100MB upload space limit is the overall limit allocated for a free account. It is not per file.

If you are on a paid plan, you would have much higher upload space limit.