Update (fourth Dec. 2015): If you’re rooted and have Xposed system installed on your device, then you can use the Use USB for Marshmallow Xposed module to MTP as Default USB on your Marshmallow running device.
Android 6.0 Marshmallow accompanies a lot of new highlights and traps, similar to the SystemUI Tuner, which is extraordinary, however not all things are advantageous on the freshest Android discharge.
When you connect your Android device to PC, you’d need to transfer files and furthermore charge it at the same time. Be that as it may, with Android 6.0 Marshmallow, the default connection setting is charge as it were. You’ve to choose MTP from the notification bar to have the option to transfer files. This is an additional progression which the greater part of us might want to maintain a strategic distance from.
We thought there’d be a simple method to MTP as Default USB, yet tragically, there isn’t any such setting. You basically can’t set MTP as default connection on Marshmallow.
Allows simply trust the blessed people over at XDA discover some trap (with root) to get around this. Or surprisingly better! Think of an Xposed module that can set MTP as default on Marshmallow. Yet, then we have to get Xposed on Marshmallow working first. Phew!
If you discover any workaround for this, do tell us in the remarks segment underneath