Noah,
Let me make sure I understand you, if you have a bunch of photos in your timeline, 1-2-3-4-5-6….and you want to swap 5 and 4 resulting in a new order, 1-2-3-5-4-6….you are telling me that if I drag 5 over 4 it will do the swap. And I tried that a few times and what it does is overwrites 4 resulting in a new order, 1-2-3-5-black hole-6.
So, unless you had select a preference option somewhere, by default is not working the way you’re describing it if I am understanding correctly.
Can you describe the way you do it?
PC