It doesn't show a PC Connection setting.
I've always been able to pick between charging and MTP, but all of the sudden it just charges and doesn't give me the option to pick anything.
You can change the USB connection mode on LG G2, based on your need when the device is connected to PC (Laptop) via a USB Cable. Change the USB connection by doing as follows:
1. Open Settings and go to General Tab
2. Scroll down, and under System settings, tap PC Connection.
3. Tap "Select USB connection method" and select one of the following USB connection modes:
Charge Phone
Media Sync (MTP)
Tethering
LG Software
Send Images (PTP)
Lean More LG G2 Tips and Tricks