I'll try to answer your questions, in no order
1. yes, one at a time using the ADD REPLY, if you used Add Reply, us the Upload photo upper right of screen and add as many as you want, just copy each url, can't do 2 or three and remember what the h
2. check under new collectors area and see more hints
3. holsters were not always with the wepon, they many times tossed into a pile, barrel etc and GI's grabbed the ones they wanted. Plus, ww1 items used in WW2...
4. make your pictures smaller