After upgrading to Ubuntu 20.04 I couldn't connect to the samba share.
I managed to fix it by adding, client min protocol = NT1
However now all the files are shown as folder in Gnome Files.
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Looks like it's a confirmed bug: https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1872476
It's already been fixed, but is not included in the current stable release yet. I you want to apply the patches yourself in the meantime, you can find them here: