What are the programs to easily copy files to android phone usb?

Question

Android

I have some kind of trouble with the phone, when copying files, sometimes copying is interrupted and you need to reconnect the phone, otherwise it does not see the device.
I tried to reset all settings and rutted, in general I reconciled myself with this trouble, somehow I throw files but 1 video at a time (so that I can throw some season of the series, nerial).
Here I think there may be something to help copy files. I tried Kies (he didn’t give any result), bittorrent sync (file synchronization is possible only on the device’s memory, but not on a flash drive or in the wrong folder I want). However, it’s the same with other programs on a bucket, you can’t set up a specific folder on a USB flash drive to simply copy files there, which is strange even with root.
Who will advise what?

Answer 1

MyPhoneExplorer over Wi-Fi
For all the years there was only a problem with one phone, I decided to set the screen to turn off after 30 minutes, in general it was necessary that the screen did not go out, in other cases it worked very well.