Samsung Frame (and other Samsung TVs with Art Mode)
Download the 4K file, then in the SmartThings app open your TV, Art Mode, My Photos and add it. Full steps on our Frame TV art page. Samsung TVs without Art Mode can use Ambient Mode on QLED models, or a USB slideshow.
LG (Gallery mode and Always Ready)
On recent LG OLED and QNED TVs, turn on Always Ready in Settings, General, then choose Gallery and add your own photos from a USB stick or from the LG ThinQ app. On LG's Gallery Design OLED this is the main art mode.
Google TV and Chromecast
Put the downloaded images in a Google Photos album. On the TV, open Settings, System, Ambient mode, choose Google Photos and select that album.
Fire TV
Upload the images to Amazon Photos, then on the Fire TV open Settings, Display & Sounds, Ambient Experience (or Screensaver) and pick your album.
Apple TV
Add the images to an album in the Photos app on your iPhone or Mac (with iCloud Photos on), then on the Apple TV open Settings, General, Screen Saver, Type: My Photos.
Roku
Install the Roku Photo Streams channel or use Roku Media Player with a USB stick, then set the Photo Streams screensaver in Settings, Theme, Screensavers.
Any TV with a USB port
Copy the JPG files to a USB stick, plug it in, open the TV's media player and start a slideshow. Most TVs repeat it until you press stop.
Any TV with a web browser
Open gildpix.com/tv-mode: a full-screen slideshow that keeps running with no app to install.
Questions
Can I use art as a screensaver on a normal TV?
Yes. Most TVs can show photos from a USB stick as a slideshow, and Google TV, Fire TV, Apple TV and Roku all have an ambient or screensaver mode that can use your own photos.
What resolution should TV art be?
Use 3840×2160 for a 4K TV and 1920×1080 for a Full HD TV. Matching the panel avoids black bars and blur.
Does leaving art on damage the TV?
LCD TVs (including the Samsung Frame) are not prone to burn-in. OLED TVs can be, so use a slideshow that changes the picture and lower the brightness.