See 1st pic.
On this site you see the original file name 'B' and the one generated by 8ch 'A'
On twitter the file name you see is equivalent to 'A' - the one they generate.
Upload your own pic to twitter - with a specific file name - then check to see what it is - it will be a string of letters [usually beginning with D] - and not the file name you gave it.
2nd pic is Q post from bread#18 - file names just a coincidence.