For other Qualcomm settings see post 5.
Update: Activity Launcher is the clear winner for creating the Qualcomm shortcut!
Edit: Many report they do not need this & it works as is.
This mod is for any users on 442 Vzw (& maybe some others) which is my only test build. Root is not needed. Ultra support is included. ATT & others have had it on 442 but on Vzw, I never had OTG support until I did this mod!
Now that the QC app has fixed My OTG I can set OTG to none and it still works! Lol! Go figure!
This is, at least, a stock/rootless solution. The OTG/UsbDisk is now system wide! /storage/UsbDisk! Root Explorer/Explorer (free)!
You need to create a shortcut to qualcomm settings.
The: com.qualcomm.qualcommsettings.apk is in your system/app!
I use Super Manager donation. The free version works too.
Filter sys & installed app
Sys app only
Long press on any file to select sort by display name
Scroll to com.qualcomm.qualcommsettings, tap!
Choose activity button,
The gear: launches the activity,
The arrow creates a shortcut on homescreen.
The standard issue "Documents" apk browses UsbDisk too, but this stock app is also not available w/o a shortcut creation via QuickShortcut: Edit Documents is not reliable as a user started file browser. It works as a system/file uploader only.
Then enable usb mass storage and OTG mode - peripheral. The usb will get reset but there is no need to keep it on. OTG mode sticks. I did both. You should too!
Use Your favorite filer app to browse: /storage/UsbDisk. Permissions will be rwx+.
You have a new mount/unmount option in settings/storage:
Be sure to use (^ above button) the unmount command as forgetting you have a write operation in progress and yanking out the otg adapter can trash your SD card!
You may use many apps to browse your new /storage/UsbDisk, this is a good one.
No need to download the attached apk. It is in your system apps already. But some custom ROMs may not have it.
More info? About other QC settings.