I was having the same trouble last week and had to ignore the instructions to make it work. Apparently if you upload to this site you will only get a small photo or thumbnail to post. I ignored "manage attachments" and ended up doing my test as a "quick reply". Then I copied and pasted the photo link of my picture from its location on the Photo bucket website where I also have it. It came up full size then. My own computer file would not load full size.