I do a 2-step:
1...Compose my ad w/o pictures.
2...Take pictures w/my phone. Login to my ad via phone. Click 'edit' at the bottom is "Attach File" button. Click and choose a picture & it will upload. Do each picture, upwards of 10 pics. Then I go into my ad and place the cursor where I want a picture to go, dropping back down to my list of pics...on upper left corner of each pic is the option to implant 'full' or 'thumbnail', I choose one and it's placed where I had the cursor. I do each pic separately and save my work.
I then go to my computer & refresh the LRH page and check my work.