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Remember kids: Canonical is not your friend.
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I use Arch btw
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Flatpak steam can do all that. You just have to learn to control the flatpak sandbox. There are CLI commands of course or you can install Flatseal which is a real nice gui that lets you control the sandbox for each individual flatpak app. https://flathub.org/apps/com.github.tchx84.Flatseal
Just add whatever drive/directory/mount point in the filesystem path for Steam in flatseal and Steam can see it.
I couldn't get it going on anything but my steam deck to read SD cards. Flatseal doesn't seem to help. The only thing that worked after a ton of attempts following a ton of guides on my desktop was to get the deb version.