Don’t know why it is claimed you can’t use external storage. I have been using a 4tb external hard drive successfully for over three years. It is connected to one of the two usb ports on the front. I only use it for games, haven’t used it for movies, but I assume it would work for that also.

It is not clear that the flex cable under the battery mat can easily tear near the end that is in the middle of the phone. There is a little tab at 90 degrees to the cable that is stuck to the back of the mat, but the rest of the cable is stuck to the phone body, and since it is not in any of the photos, you won’t know it’s there until it is torn. It’s unclear if you peel the mat all the way off, or just partially peel it back.