I had rest my phone without backing up newly purchased watch faces. They can be restored by:
1) Open the galaxy store app on your phone
2) Click on 3 dots top right
3) Click on My page
4) Click on All
5) Click on Watch
You will see all your past purchases.
6) Click on the download arrow to download them to your watch again.
7) After downloading is finished just hit the play icon next to the face you want to use and it will make it active on your watch.
Hope this helps. Thomas
And where oh where are all of my purchased watch faces from 2018-2019, Samsung? You get sued by Swatch, and you tuck your tail between your legs and essentially steal my watchfaces that I purchased. No refunds, no letting me download my faces that I bought legally. Way to go, you putzes. I hope the Pixel 6 kicks your Galaxy sales into the dirt. Putos.