How to delete iphone photos (on device) but keep them in google photos app?

Is there a way to delete photos/videos from iphone camera roll (all photos-in the photos app) but still have them remain in google photos or google drive?

I'll rather suggest you to download DROPBOX application on your iphone and upload all the data or photos or videos and whatever you want and then delete the photos from your iphone. You can also use icloud for the same thing. I'm also an iphone user and I also use the same app ( dropbox).

Just make sure they were uploaded to the Google Photos/Drive app & then they could be deleted from the Camera Roll