- Edited
gonzalo
https://github.com/lukaspieper/Gcam-Services-Provider
Here's the relevant part:
The only reason to consider Gcam-Services-Provider on GrapheneOS is the ability to use the button in Gcam that opens the last taken photo without having Google Photos installed. If you can do without it, you don't need this app.
For this functionality there's "Photosonly" flavor of the app on github releases page.