"Amazon photos app"

I may be losing my mind, but I cannot seem to find the Amazon Photos app searching in Google Play Store when I am using the DirecTV Stream box. (So I'm not using a Fire Stick or Roku or a smart TV, I'm using the DirecTV Stream box.) I have Googled all of the internet I can think of 😁, but have not found any info on whether the Amazon Photos app is available on the DirecTV Stream box. Any help would be appreciated, thanks!