Format as ExFAT instead but youll still need to make it bootable.

It depends on who the streaming company is, but you could look into FreeCast. Short of that, you’d be looking into a media player type app that can take streams and put them into one location.

Who is your registrar? Who is your web host?

If you want MS then you can easily do it but you need to connect the domain to ‎Microsoft 365‎, Business, and not a personal account.

It is entirely different from a personal account, particularly management etc.

Question:

What is your objection with Google? Define "secure email with my domain.

External drive MAY work but its likely going to write to temp first, which will take up space.

10 gallons of water in a 5 gallon bucket.