Point a Raspberry Pi at an SMB share, a Google Drive folder, or a local folder. It plays every image and video full screen, in order, from the moment it powers on.
Any Raspberry Pi running Raspberry Pi OS Lite. Plug it into HDMI and power.
Generate it on this site with your share and login. Paste it on the Pi.
Screens pick up changes within a slide. Rename files to change the order.
Takes about five minutes.