Difficulties to find out how to configure shared folders
When I first used gnome boxes in Fedora 29 (3.30.3-stable) I had a hard time to find out how to share a folder with Windows 10. The tab "devices and sharing" was basically empty (only showing a CD drive).
I found out that I had to install the Spice WebDAV daemon in Windows and boxes showed the sharing UI afterwards. I think there should be some text which mentions which client-side software needs to be installed to make folder sharing work.