which MacBook do you have?

if you record in HDR, uploading that raw footage to YouTube should produce an HDR video. to get the raw footage, you can either upload the file directly from the phone, or AirDrop it to your Mac from Photos (you should get a .mov), or sync it to iCloud (or connect the phone over USB, maybe) and then use Photos' "File > Export Unmodified Original"

I have an M1 macbook, and an iphone 13. Thanks for instructions I think you are right I have to do a specific flow so the HDR isnt lost ie in software like CapnCut I suppose. Thanks again for the help m so glad Ive slowly figured this out with ur help.