Yes, you can use an external drive for filming on an iPhone, specifically the iPhone 15 Pro and iPhone 15 Pro Max models. These devices are equipped with a USB-C port, allowing you to connect an external storage device to record ProRes video directly onto the drive. Here's a summary of the process:

  1. Ensure your external drive is formatted using exFAT, supports USB 3 with a 10 Gigabit per second transfer speed, and has write speeds of at least 220 MB per second.
  2. Open the Camera app on your iPhone 15 Pro or iPhone 15 Pro Max.
  3. Plug the properly formatted external drive into the USB-C port on your iPhone.
  4. Enable ProRes video recording within the Camera app.
  5. Start recording, and you should see an estimate of the available recording time based on the capacity of your external drive.
  6. After recording, you can view the video files using the Files app on your iPhone or by connecting the drive to a computer.

Please note that this functionality is currently limited to recording ProRes video, which is commonly used by professionals due to its high quality and large file sizes. Other video formats cannot be recorded directly to an external drive on these iPhone models according to the information provided.