顺便分享怎么在安卓手机上传文件给电脑，刚刚弄懂。

1） Enable phone Developer Mode:

       go to apps setting, -->about phone -->software informtion

       There is a "Build Number" there, 用手指在上面拍几下，直到看见 developer mode enabled.

2)   go to app setting again, scroll down, you will find "developer options" , go there ..

      schroll down .. you will find " default USB configurations"  , go there ..

      choose " Transferring files" as default.

After these, connect your phone through USB connection to PC,  on you phone, you will see msg: allow to access files on phone?  choose yes. 

You will see the files on your phone on your computer !

You can change to default USB configuration back to charging mode after that by following the step 2 above.

Good Luck!