“I use post image , and Chrome, and once I have selected the photo and then "share" i click on the right hand side of the second bit down called "dierect link" which then says copied. Go back to PC post page . Go to the little square thing with the chain link. Punch in 400 then below delete the https , and paste in that bit and then insert. Check preveiw and the photo should appear....”
You need to upload it to a hosting site. Also look under “ Photography” for further hints.