Within Google Photos, scan or search your pictures to find the images you’d like to Share. Once you choose a photo, tap the share Icon in the bottom left-hand Corner. In the list of available applications to share with, you will see the PhotoShare Frame App. You may then select additional photos.
Note: each Photo Sharing application has a limit on either the number of photos or total file size that may be transferred and if the limit is exceeded, the PhotoShare Frame App will no longer be an option. Deselecting a photo from your list should allow the PhotoShare Frame app to reappear as a destination option