The Android options when connected to a computer changed with Marshmallow. You should not have to use Developer Options unless you are performing Advanced tasks. This info from Uncle Google might help:
The new USB options in Android Marshmallow can be confusing for many users. This Android Marshmallow guide explains the different and new USB options in Android Marshmallow, and how to use them.
What are USB options in Android Marshmallow? Why it matters?
For all Android phones and tablets, you can connect them to your PC so that you can transfer files between the PC and the Android devices.
You can also charge your Android devices through USB ports on the PC if you have no chargers around. The charging can be very slow if you are using the USB 2.0 port.
So, to use the USB related functions properly, you need understand and choose proper USB options.
USB options in Android Marshmallow is significantly changed, compared to the feature in Lollipop or older versions of Android: the default USB option is charging only, not MTP+charging.
This is the reason many Android users get some problems with USB connections after updating the device to Android Marshmallow or when getting a new Marshmallow device.
Please note, to use USB features except charging only (and MIDI), a proper USB driver for your Android Marshmallow device must be installed on the PC. You need get the USB driver from manufacture’s website.
How to switch USB options in Android Marshmallow?
When your Android Marshmallow device is connected to the PC with the USB cable, you should get a notification as shown below.
You can tap USB for charging as shown below to get more USB options.
In Android Marshmallow, the USB options include:
Charging only (default, new in Android Marshmallow).Transfer files (MTP). The MTP(Media Transfer Protocol) option is for you to transfer files between your Android devices and the PC. All files types are supported.Transfer photos (PTP). The PTP(Picture Transfer Protocol) option is for you to transfer photos and videos. Once this USB option is selected, only photos and videos in Android devices are listed on the PC.MIDI (new in Android Marshmallow). You can connect a supported MIDI (Musical Instrument Digital Interface) device to Android device. Some Android manufacturers may disable this feature.
You can tap any of these options to switch to it.
What are the default USB options in Android Marshmallow?
As mentioned, the default USB options in Android Marshmallow is charging only.
This means if you want to transfer files through USB cable between the PC and the Android device, you need change the USB options to MTP or PTP as mentioned above.
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