I'm having serious errors trying to use the app on a 15 Pro with external drives. I have a 4TB and a 2 TB Sandisk Extreme Pro v2 (with upgraded firmware). They have both been used with a 6k Pro to record several 2hr+ shows with no problems at all.
On the app, I can select them fine, but trying to record even ProRes Proxy, I get warnings after 11-20 seconds. Stopping the video after 30 seconds, the timecode and drive indicator will flash for 3+ minutes as it looks to be trying to save to the drive. It then locks up the app and it seems the drive unmounts because Files won't find it either and locks up. And boy does it drain battery!
The file that ends up on the drive seems like an incomplete file that pauses and stutters all throughout. The proxy has issues too and a massive audio white noise spike most of the time. App works fine with the (very limited) internal drive, but REALLY doesn't like these two externals I have.
iPhone 15 Pro
OWC USB/TB 4 Cable
Sandisk Extreme Pro v2 2TB (Model SDSSDE81-2T00)
BMC App 1.1
Recording ProRes 422 Proxy - Apple Log HDR - 24 fps
Edit: After a little bit of googling, I found this:
https://discussions.apple.com/thread/25 ... 9724865022Moral of the story, don't use Sandisk Extreme Pro v2 with your iPhone - looks like it want to draw too much power