Need help with USB OTG on android

[herberck]

Hi, thanks for this awesome emulator but i have a question:

my PSP rom files are so big that i can only put 1 or 2 on my tablet before the storage is full so i bought a USB stick to put the rom files on that.
First of all i wonder if that would even work in theory that PPSSPP uses the Rom file directly from the USB stick?
Second id like to know how to do that in praxis. I have the Nexus media manager so i can watch movies i put on the stick just fine BUT i cant tell PPSSPP to look on the USB stick for roms (cant point to that directory).

My tablet is not rooted so maybe that would be necessary, or is there maybe an option to use PPSSPP as default for opening ISO files?

Big Thanks for the emulator and i hope somebody can help me