Unable to mount USB stick on Qualcomm RB5

I am using Qualcomm RB5 board and flashed Android 12 in RB5 following the steps mentioned in AOSP/rb5 - Linaro Wiki.
On connecting a USB stick (pendrive) to the board, I am unable to mount the USB stick on GUI.
Is there a way to mount the pendrive on Android and view it on Android screen.

Any help would be highly appreciated.

Kunal Goyal