No permissions for Flathub App

I installed KiCad via the ZorinOS store via Flathub:

But it turns out that KiCad doesn't see my other drives. It even says that I my computer only has 33.6 GB, while it has 1.5 TB:

What is the reason for that? There is also a Zorin OS apt package, but unfortunately it is outdated.

The Stable branch packages are an earlier version. This does not mean that they are "outdated" - It means they are the stable branch, not the cutting edge latest Beta Release.

Flatpak packages always are containerized which means that they cannot communicate with your system. The system is already sandboxed, Snap and Flatpak containerizing within it means that these packages end up double-sandboxed.
One workaround is to install Flatseal and use the Flatseal GUI to assign broader permissions to Flatpak packages. This does not always work but usually does.
If Flatseal does not resolve your issue, another method may be to use the latest stable package from APT.

Thank you for your detailed answer. So the APT package is just from the current Ubuntu release, 22.04 LTS in case of Zorin OS 17? Then that makes sense, I first thought it is a seperate database only cared by Zorin OS.

I will try Flatseal, thank you.

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Yes. The majority of packages are hosted by Canonical (Ubuntu).
Even your current distro-specific packages are uploaded to Launchpad.
This is as true of my own packages as an independent creator/dev, that are uploaded via Launchpad and available through the Ubuntu Jammy, Focal or Bionic repos.

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