Success at last! No thanks to Samsung Support or the owner's manual. I have a Samsung Q80R65 TV and I have been trying to get a simple slide show working, using photos from my semi-pro camera. Ambient was a dead end and worthless. I finally found a hint in another customer post. Reformat a USB stick into NTFS format instead of the FAT32 that comes standard. (right click on USB with it in your computer and the format option will give you the NTFS option). Then load a bunch of photos on the stick. Then stick the stick into the USB port on the back of the TV. Bring up the Home bar on the TV, scroll LEFT until you see "Sources"., move up into source options shown, scroll over to USB stick and click on it. Click on a photo, then quickly scroll to options that flash on screen for only a few moments and choose "fit screen", then hit the forward arrow > . You now have a very sharp slide show. Just leave the stick in the TV, and use Home button to get to your other sources. Yay! You don't need a Frame TV and the picture quality on the Q80 series is awesome.
This is typical of Samsung. They provide minimal and I do mean minimal usability to their software, refuse or ignore suggested updates. I recently bought 65 even though my husband not to buy Samsung again after my last phone fiasco.