How to transfer files from windows explorer to hass.io?

should be straight forward or? It takes ages, and once transfer is done, file is corrupt

In log I receive this, like if the files was not transfer correctly from my backup?

2017-10-05 21:01:17 ERROR (SyncWorker_0) [homeassistant.util.yaml] unacceptable character #x0000: special characters are not allowed
in “/config/customize_my.yaml”, position 0

Do you mean outside of the shares that that samba addon exposes?