@Romano6 to answer your questions, when I was having the photo shoot
1. I could change order, delete pictures and add caption. I was just adding captions to some of my pictures the other day, so that feature is there
2. Yes, you pictures are there, you can keep them or delete them or mix and match
3. You are not supposed to however airbnb has instructions on how you can save pictures. It is intended to be for airbnb use only. For example, you have a listing for whole house and only some of the rooms. You should be able to download the pictures of the whole house and use the applicable ones for the rooms only. I have never heard of anyone getting in trouble for using them on other sites but you are not supposed to. So that one is for you to decide.
My shoot was about a year ago and a disaster but for other reasons
@Rowena29 great memory! Thank you for tagging me