One of the really big frustrations I have with my phone is that the delete function doesn't seem to work. Eventually the photos I take fill up the space I have on them so I need to move them off. Usually that should be pretty straightforward. For me it's a time consuming nightmare.
I have no idea why but the erase function just doesn't work. The only option is usually to do a factory reset.
I have spent the last ten minutes trying to erase two photos. It just won't work.