If I could chip in with a plug for Valent which @epinez pointed me to in my cry for help getting GSConnect going - it is a replacement for GSConnect with phosh clearly the target (iirc, the develper is running phosh on postmarkos). Valent offers a mount option, similar to GSConnect - but, it is one of the features that may be in need of further development. It is in alpha atm and I’m sure the more uptake there is the faster the development will be…
I installed it by downloading the nightly Flatpak, see Status here. Then running:
sudo flatpak install ./valent.flatpakref
From the download directory.
hth. M