My Android 6.0 allows me to browse the intern memory without the need for third party apps. I simply do this*:
* Words may not correspond to the standard English version ones, since I'm just freely translating them from Portuguese.
Note: At least in my phone, /storage/emulated/0
does not correspond to SD card, but to intern memory. This method did not work for my external card, but I never tried it with another phone.
Hope this helps!