Yeah I did a trial and error kind of thing for ages with different format of video and snap/thumbnail etc etc, all with no success. Then found a post mentioning the chrome/private mode/steemconnect combo and when I tried that it was all sweet!
So yeah if it works for you and you see another Steemian having the same issues pass it on!! =)
RE: For all who can successfully upload to d.tube, what am I missing here?