It wasn’t a conflict with other plugins.
Site A was having the problem of not uploading photos. I went to our other site (Site B) and it didn’t have any problems uploading photos.
Site A is on 2.0.16 and Site B is on 2.0.12.
The difference was that Site B had nothing in the
Profile Photo Maximum File Size (bytes) field on the Uploads tab.
I went to Site A, cleared the field (they both had 99999999) and now profile photos upload with no issues.