Welcome to the board.
The board will accept png, jpg or jpeg, so long as they are less than 125kb in file size. If you are trying to post from an iPad you will not succeed, that's a problem with the way the iPad works not of the board so we can't fix it. If you would like to email me copies of your photos I will check them for size and resize if necessary, and upload them for you. glassmessages.tsm@outlook.com will reach me.