I upgraded our Jira server from 7.5.0 to 8.1.0 and manually copied the attachments, avatars and logos folders across from the old volume to the new volume (within a docker).
The attachments and avatars work fine but the logo and favicon do not.
I have tried to upload a new logo or favicon but both fail and the error screen provides no information.
I read online that others have had the same issue and managed to fix this by resetting to the default but there is no button or link to reset so I'm not sure how to even reset these and am completely stuck so any help would be appreciated.