Picture from PS4 set as wallpaper for Roku?

I'm playing Horizon Zero Dawn, which has a photo mode, it can absolutely be breathtaking. I take the screenshots on my PS4. I set them as wallpaper for my PS4, anyway I can upload them to the TV so when it turns into a slide show (after being idle for a while) it shows 10-12 pictures I uploaded?

Everything I come across requires me to stream the pictures from my phone onto the TV to show, which I understand for presentations and showing family things. But I just kinda want to put my own pictures up there. I can figure out pictures from PS4 -> phone, but is there a way to upload pictures from Phone and to keep them on the TV?