ZUGate

Fantastic. Fully free no spam way of developing apps/apks on a usb stick that must have bitlocker encryption. However as a 100+ user in 3 days I have some UX feedback, please allow auto open on mount, so that when you mount it opens the drive(setting), and also since you find the copy button In the top right, paste should also be there or atleast the copy button now at the button should read paste since you copied the file already to memory now you want to reproduce it in a new location. 5*

Works fine, my only issues are that 1) I cannot move files from my USB to my phone or vice versa, I'd still have to connect both to a PC. 2) I cannot view files that are zipped, meaning, again, I would have to plug the USB/Phone into a PC and unzip the files first. 3) It takes upwards of 5 minutes for files to load. I thought this was due to how large of a USB I was trying (100gb+) but even trying a USB with only 5mb worth of files on it takes 5+ minutes to load too.

Alternative USB OTG reader. Found it by accident on Playstore and still impressed by the capabilities. If stock file manager can't access or read USB formated other than Fat16/32, extFat or NTFS this App did it all! It can read and access multiple partitions on the stick or even hard drive (external power supply recommended). You can mount them separately in RO/RW mode and copy/move/delete data directly. App will even make USB drives visible to other Apps on your device! Great work:-)