I’ve had the same problem with a usb ssd, I’ve found a workaround but no solution. This thread FS#1305 - Not working UAS driver for usb hdd case ORICO 2599US3-V1 · Issue #6243 · openwrt/openwrt · GitHub explains a bit about it and give two solutions. Only the second one works in my case and doesn’t survive a reboot. What worked is this command echo 357d:7788:u > /sys/module/usb_storage/parameters/quirks but replace 357d:7788 with your own VID:PID after you do this plug the device into the router.
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