How to set Android M default USB config to MTP rather than “charging only”?

Question

Whenever my device (Nexus 5, Android M Preview 3) connects via USB, the USB config always defaults to \"charging only\".

This is quite problematic because the USB port

Answer 1

I just tried this on my Nexus 5 (Android 6.0.1) and it worked:

• Make sure your phone is NOT connected to any device over USB cable
• Go to Settings - Developer options - Select USB Configuration
• Set your desired default connection type

The trick was to have a phone disconnected from USB. I guess the idea behind such a behavior was that if you set an USB connection type while your phone is not connected to any device, it will be treated as a default behavior.