If you post an observation’s ID number in the search box you’ll see its photos. Let’s say I wanted to add a fruiting photo to Calochortus umbellatus. I can find a photo (for this example I’ll just use my recent one) and enter the observation’s number (in this case 112983280). I then see:
So that’s the current workaround - find the observation you want and then search for it in the photo editor. But I agree it would be cool to have filters in the photo editor.