Please make sure to update PhotoTV to version 1.9.25 in order to be able to link PhotoTV to Google Drive as the link flow has changed (Roku Home Screen → Settings → System → System Update → Check now).
PhotoTV allows you to display photos from your Google Drive account on your Roku TV/device. Supported file extensions are .jpg, .jpeg and .png. To set this up, you will need to do the 2 following steps:
1. Create a Google Drive source linking it using a link code.
2. Link folders under your Google Drive source.
At any time, you can modify source and folder information, link more sources, folders, etc. Changes to the settings as well as folder content will be applied the next time the slideshow/screensaver runs.