Hi there,
If you ever wanted to know how to access our android phone files from terminal, without using any third party app and just with a USB cable and GNome, here is how:

We need to check the GNOME Virtual file system (gfvs) to see it is available.

run the following command:

ls /run/user/1000/gvfs/

You will get an Media Transfer Protocol (mtp), for more about this, check this link: MTP

'mtp:host=PHONE_MANUFACTURER_AND_MODEL'

Now use it as it would be any other directory on your system

cd /run/user/1000/gvfs/mtp:host=PHONE_MANUFACTURER_AND_MODEL

Done, you can access your phone directory and do whaterver you want.

Bye!