Hi hello from the future!
I was having the same exact problem as I have decided to switch to Affinity and stop using Illustrator for cost purposes. I'm working off a M2 Max MBP, 98GB RAM. All brand new, and the software was just installed yesterday.
Anyway, I download my vectors from Vecteezy (with subscription - so they're paid), where most of them are EPS (if not SVG). I don't sync with iCloud, but I do use OneDrive. I moved the file out of my sync folder and onto my desktop folder. It worked normally. So this is some weird bug or something.
- I did try re-saving the EPS as an Affinity file on my onedrive folder, that worked.
- I did take the original EPS and copied it to the desktop, and moved back to the onedrive folder. This did NOT work.
- I did open the EPS from the desktop (worked fine), then re-exported to onedrive folder. This worked. *derp*
So hopefully anybody runs into this, open file in local un-sync'd folders first, and then try again. This is gonna be a weird workflow.