[The_Media_never_lie]

If it is manueverable, it must have a propulsion system. The air at 63,000 feet is not calm.

I have not seen any evidence of a propulsion system.

[TexasGator]

https://www.bing.com/search?q=hot+air+balloon+maneavering&cvid=bdb39999d0fc427e8a4a19e2ff76f462&aqs=edge..69i57j0l8.23933j0j1&pglt=43&FORM=ANNTA1&PC=U531

[neverevergiveup]

If not a propulsion system, a way to steer it?

[steve86]

USAF repeatedly describes a prop or props, and a rudder (although it might be differential thrust to the props acting as a “rudder”.