"There was a problem uploading a presentation. Please try again." aaah!

I get this error message every time I try uploading a presentation to iCloud from my Mac...

I called Apple yesterday and the man was very unhelpful, making me sign in and out of iCloud on my Mac for some reason.... it did noting. I've tried resetting my Mac/uploading several other documents, but nothing's worked!



Is anyone else having this problem, or know a fix? Thank you!