Changes not saving

Hey guys ! One of our users is having issues saving their work on an app. Ive checked and we have the business plan, he has edit permissions*(at one point even had own permissions)* , also verified that only one user is working on the project at the time, no multiple open tabs of the project as well. We do not seem to be having any luck getting him to save his work. Any help would be appreciated , I will link a screen recording of the issue down below , Thanks!