PSVita-StorageMgr VS vita-udcd-uvc

I dunno. But you can try and use https://github.com/CelesteBlue-dev/PSVita-StorageMgr instead. It does the same thing, just in another manner. I had trouble with yamt, so I still use storagemgr to this day

Storage Manager A Kernel plugin that automatically mounts/redirects any storage device to any mount point; Popular plugin for mounting sd2vita (CelesteBlue)

Don't use USBMC, rather use storagemgr (https://github.com/CelesteBlue-dev/PSVita-StorageMgr) as it's "newer" using some of the usbmc code (or YAMT? yet I haven't actually tried it with an HDD)

Do you have the plugin for sd2vita, set up properly? Are you using YAMT or storagemanager? Has the 64gb micro sd been properly formatted to work with the vita's sd2vita?

Which sd2vita driver (plugin) do you have installed? YAMT or storagemanager? Or did you install using vitaDeploy?

Also I think its time for you to move away from "gamesd" and move to something more modern like yamt or storage mananger.

StorageMgr and yamt. Both has its advantages and disadvantages. I find, storage manager for ease of use, yamt for better read speed. I say for now, use storagemanager and once you're familiar with the Vita and its working graduate to yamt.

Storage Manager A Kernel plugin that automatically mounts/redirects any storage device to any mount point; Popular plugin for mounting sd2vita (CelesteBlue)

When on 3.73 you can only use Storagemgr.

The more involved guide says to use storage manager, given how messed up your set is currently maybe use this until your more comfortable and familiar with the Vita and its set than move to yamt later. Remember that the sd2vita should be ux0.

Use this kernel plugin to make the Vita emulate a webcam when plugged into a PC. Open any camera app (or OBS, etc) and you'll see the Vita screen. Some elements, like the volume bar and the settings overlay do not appear on the stream though.

Would this plugin work alongside the USB streaming plugin ?

Popped in the plugin and did a restart and found the app didn't work when testing with AntiMicroX and an online gamepad tester for readings, until I remembered I installed xerpi's UDCD.skprx installed to turn my Vita into a switch (well, connect it to a PC for a bigger display).

the vita's display gets streamed to the PC via the udcd uvc plugin which can be found here

vita-udcd-uvc Stream your vita to a computer using USB (xerpi)