9f612c26__device____Twitter_Help_Center__ll_see_on_your_Android_device_
This permission allows us to help make your app experience better, faster, and reduce data usage. For example, we can use the USB storage to cache photos and avatars on your device.
Modify or delete the contents of your USB storage
Why is the Twitter app requesting permission to access features on my Android device? | Twitter Help Center
Android permissions (what you’ll see on your Android device)