What did you expect him to do in the middle of a riot? Take over the TV stations? Imagine the fallout from that!
He posted on Twitter and Youtube, which between them had hundreds of millions of followers. It was a standard method people post. You can't expect the administration to set up a random server to post a video and expect everyone to know where it is. Don't be daft.
The accounts were banned within 20 minutes of his posting the videos.
Fascists will silence voices. We know who the baddies are here and its not Trump or his supporters, its the people that used the power of government and media to ban free speech and mandate expiremental therapies AND silence a sitting president during a time of unrest.
Think about it. He said go home peacefully and the deep state took that down and pretended like he never did it, you believed he never did it, and the general public has no clue.