TWRP OTG support?

I have a 64 gb corsair USB stick. On one end it has a normal usb port to plug into the PC, and on the other end, is a micro sd port for use with phones. I can use the external storage fine while booted into Android. However, I'm tryign to use it for TWRP backups, but I cannot get it to show up. I have tried mounting USB-OTG in TWRP (I'm using 3.0.2) and selecting the USB-OTG storage, but nothing happens.

Any suggestions?

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