XF 2.1 Members can't upload or link images on profile


Apologies if this is just a setting I'm missing, but I'm getting reports from members that when they try to add an image to their profile post via upload or linking, that they receive the error "Something went wrong, Please try again or contact an administrator."

But as the admin, I am able to link an image via URL but not upload.

Can someone walk me through what I'm doing wrong? Thanks!