ES explorer can't write extSD

Hi ev'body,

If I have no problem for writing on ext SD (Samasung 64Gb) with the stock apk "My Files",
when I try to do it with another file manager (ES explorer for example),
I'm asked to choose the root dir on the ext SD, but this one doesn't appear on the list!
Idem with other FM. Where is the bug?

Thanks for help



6045Y, unrooted
5.0.2-010 06

Can't detect internal storage on explorer

I got my 5x, unlocked the bootloader, and then tried to copy some files to it. However, while the device is recognized by adb and explorer, opening the device on explorer doesnt show the internal storage file structure. I think it might be related to device drivers? What did you guys install in terms of drivers.