Problem with installation POP_OS 20.04LTS on Acer Aspire 3 from USB - can't see drive

Hi!

I've recently purchased Acer Aspire 3 with AMD A4 9120e processor, Radeon R3 Graphics, 4GB RAM, 256GB SSD with Endless preinstalled. I have disabled secure boot and managed to start POP_OS installation process from USB drive, and everything works fine until I get to this step;

https://imgur.com/PqXqFGR

at which point, whatever I choose - there is no drive to select from;

https://imgur.com/9jKZphL

also, if I choose Custom;

https://imgur.com/YCQm7bm

I get this message:

https://imgur.com/4Fd5C3s

https://imgur.com/YVtia24

I'd be grateful if there is someone who can help with this :)