No folders showing up when connecting Moto G4 via MTP

I just recently bought a Moto G4 and I'm trying to put files on it, however upon attempting to use the MTP mode, neither my SD card or internal drive show up in the phone's MTP folder. Moto G4 clearly shows up. However.. There is nothing in that drive. I have switched it between PTP and MTP just to see if it could detect either, but neither showed up at all. Developer settings are enabled, along with adb/root. My phone is using Lineage 14.1's latest nightly. What do I do? EDIT: I've discovered that the SD card can show up, so long as it's formatted to be portable. It will not show up if it's formatted for internal.