Sorry for my forum etiquette mishap, and thanks for the direction to that post.
Ended up being a weird issue where even though I've had OneDrive disabled for years, I must've had it on when I had initially installed ESO on this machine so long ago. The screenshot trick was directing to a local file that didn't exist, but upon searching I found it in OneDrive.
No idea what that AppData ESO folder is even doing on my machine at this point lol.
Thanks, and I promise to read stickies from here on out