How to mount MTP devices on Arch Linux
It comes down to this:
yay -S jmtpfs
mkdir ~/mnt
jmtpfs ~/mnt
A word of caution
I had the audacity to try and copy my whole music collection (about 100GB) with this method, which at some point stopped because an ‘general IO error’. Now I have a folder in my home directory which I can not delete, move, copy or anything else.