I've learned how to brute-force getting a full gallery save, but it's a desperate attempt so it doesn't take into account anything that happens during gameplay due to it. You can find your Unity save, then put it into
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and change every value that
specifically is valued 0 to a 1. Doing this unlocked all the current gallery images. I don't know if doing this fucks with the story or gameplay, but it's a desperate attempt, so I wasn't too worried. Maybe someone can come in and pick up my method and comb through every value trying to see what value each image is attached to, but I'm much too lazy to do that.
EDIT: Almost forgot to say that this is only for the phone pics. A.K.A things the girls text you. I don't know if it works for anything else.