android 10 – Guide says to install TWRP image but TWRP can’t read it. What now?

I’m following this guide
to upgrade from Android 8 to Android 10.

I’m having issue with the fifth step that says “In recovery menu, tap on Install button > Install Image > Select the TWRP Image file from the location where you have moved earlier.”

My phone is booted into TWRP recovery menu and when I head over file manager to see
all required files I transfered earlier I can see that TWRP.img file isn’t showing up
but it is there because file manager on my Ubuntu computer can see it.

How exactly reader supposed to install it if the recovery program can’t see the .img file ?

Any guidance is much appreciated.