Direct Stream remuxes the original streams into a new container - HLS is popular on Roku, not sure exactly what it is, but that’s the ‘Work-Around’ deployed on the Preview App - until Roku INC does something on their end:
The Preview App is a Private Channel - not in the guide, but also not subject to Roku’s Approval Sequence… so you get it and all it’s updates in moments, not (what seems like) months.
Installation Details (it’s pretty easy):
The Preview App and The Official run independently. You can have them both installed. I’ve been using the Preview App exclusively for a couple of years. I uninstalled the Official App some time ago. It seemed redundant to have both.