The upload image function recently broke on my backend, and I have no idea what may have caused it. This product already has a photo. I can click to add a photo, select the photo, but it never actually shows up on the page. Here is what it shows after choosing the file to upload.
Reverting to an old backup works, but as soon as I run setup:upgrade it breaks again. Happened on 2.1 and now still happening after upgrading to 2.2.7
Bump
Same issue, there is a post on github but no solution...
Found a fix for my issue, by disabling the module: Magento_ProductVideo