Putting anything into POST value 'randomname' will cause it to return a random filename + ext (xxxxxx.ext).
Putting a custom name into POST value 'name' will cause it to return a custom filename (yourpick.ext).
Putting anything into POST value 'randomname' will cause it to return a random filename + ext (xxxxxx.ext).
Putting a custom name into POST value 'name' will cause it to return a custom filename (yourpick.ext).