Note: This content is to help fellow steemians to overcome this UKNOWN ERROR, and I made this base on my personal experience and how I got to solve this UNKNOWN ERROR.
I hope that this will help you guys.
I tell you man, it almost got into my nerve.
My first upload on DTube just went well without an error. After a couple of days when I plan to upload my second content, then I got this error "UKNOWN ERROR". I though that MAYBE because I was using a mobile data but I recon that my first upload I used a mobile data. So, I thought MAYBE it's the internet connection is slow. So I didn't proceed to upload and plan to upload it the next day.
And then I discover ONE THING. So I hope this will solve your problem too.
When putting a Tag for your content don't put "#" on it, just the word
that is very wrong. That is why I didn't noticed right away the error.
This is the correct way on putting TAG
Never put a "#"
I hope that this will help you as it helped me.
Please RESTEEM to help your FOLLOWERS too.
Thank YOU!!!