ZEBRA TC 75 => view structure of  folder on my windows ?

Hello all,

i have a zebra tc 75 as a device and visual studio 2015 with xamarin.

I have a little app who is installed by USB cable all works fine, the device is on my developer ...

 

But i can't understand why now i'm not enable to view the structure of the android device on my windows pc ...

each time i open the windows explorer on my windows 10, click on TC75X the folder is empty ...

 

What's wrong ...

thanks for your help and all your developement