External 500 GB SSD not showing up in UEFI BIOS

I am trying to boot an operating system installed on my external ssd , but whenever i enter the boot menu the external ssd wont show up, i have tried everything, switching between legacy and UEFI, disabled secure boot startup, and the cable and ssd itself are working fine since theyre showing in my disk management chart, so can anyone help me out here? i have tried plugging it into both my usb 2.0 and 3.0 ports, still nothing, its plugged into the 3.0 port at the moment and uses a usb cable type c. i have a Lenovo ideapad gaming 3. Any solutions? would appreciate any help.

Hi @PurplePopskin,

Please refer to the below link to troubleshoot the issue:

Title: SSD drive is not detected in Windows
Link: Cruzer flash drive NOT detected by Windows PC

Title: SSD drive is not detected in Mac
Link: USB Flash Drive / Memory card not detected on Mac USB port

Hope it helps!!