Yes - the photos/videos you share (and the ones other people share with you) are uploaded and stored in AWS. You can download/export them - you wouldn't need to

Yes - the photos/videos you share (and the ones other people share with you) are uploaded and stored in AWS. You can download/export them - you wouldn't need to do this with the photos you add since you obviously already have them on your device but video recordings and any photos other people share with you can be downloaded.