If you have been having problems uploading to Dtube - as I have - I think I have the answer for Mac users anyway. Safari was the issue for me, it is often not supported as well as other more poplar browsers. I recommend Firefox as an alternative in all those situations, and Firefox solved my Dtube woes!!! - catch my latest post ... WITH Dtube! https://steemit.com/dtube/@icedrum/b99h94mi
BIG thanks to 
