Unabled to add new covers to existing comics

I have some high res covers I'd like to upload to replace some lower quality ones, but I don't have the option to submit the edit after uploading it. If I change text or something, it immediately lists as a change, but still doesn't list the cover upload. I see someone else had a similar issue:

Unable to add covers to comics - Bug Reporting - Comic Vine (gamespot.com)

Yeah that button is broken, going in for second year now. The tech people have been notified of it, and I don't know if they ever fix it.

Right now we can only add new images by circumventing the button and end the url with /images that will open a gallery view and new images can be uploaded there.

However make sure you use correct retail images, not preview ones. Retail vs preview

But let us know where in Wiki Requests, as the old ones should be deleted afterwards.

@midnight393: I did tell you about the preview covers, so I can't approve them.