Assuming you mean general photos of the landscape, signs, gates, etc., not photos of individual graves.
You can do it either way, as photos of the cemetery, gate, sign do not need to have GPS tagging (They should but they dont).
If you take them with regular camera, then save them to your computer/drive, all you have to do then is to to them to add them to the cem page.
If you take them with the app, then you have to open them in the transcribe window, copy then and save to your drive, and then copy them back to BG cemetery page. It is an extra set of clicks, but fine to do it that way. However, if you try to copy them from the "MY PHOTOS" directly they will come up fuzzzy, as those are actually just thumbnails.
I just use the app and do the extra clicks, so I don't have to deal with the digi-cam.