WD SN550 SSD not showing boot menu

Hi
I am using Acer Aspire A315-55G with 1TB HDD& 8GB RAM.
Recently i bought WD SN550 M.2 SSD and Installed disk management shows new Hard disk and allocated some simple volume
I was cloned my HDD os drive to m.2 ssd when I try boot from ssd not shown in boot menu.

Note:NOw in laptop both HDD &SSD are present

kindly help me

The final step after you’ve installed the M.2 SSD is making sure your computer recognizes it as a new storage device. Some motherboards will automatically detect an M.2 SSD, but when that doesn’t happen, you’ll need to manually tell BIOS that an M.2 device is connected. The exact process from BIOS will vary depending on your motherboard.

Try the solution in this link:M.2 SSD recognized, but not showing up in the boot order? — Acer Community