There’s also the possible case where two obs share the same photo but not the same image (eg. one only has a zoomed in and cropped view of one or more of the images in the other observation).
They are still the same photo, but not the same digital image and won’t share the same checksum (as would be the case if I uploaded a .jpg to one and .png to the other of the same original photo).
So it would be nice to (also) have a way to manually indicate observations are linked together in time and space rather than only doing it indirectly by sharing a bit-exact image between them.