Digital picture frames
A digital picture frame is a small screen with a card slot or an internal memory, built to cycle still photos. It was filed with cameras because the pictures start on a camera card.
The screen is usually a different shape from the photo. The frame crops, letterboxes, or stretches, and the menu that chooses which one is easy to leave on stretch. Copying files into a folder the frame ignores is the other common miss. Many frames only read a DCIM folder or the root of the card, not a nested album. JPEG is the safe file. A RAW file from the camera will not display. Power is a wall brick. The few frames with a battery were for carrying the frame to another room, not for a day away from an outlet.