Cannot import files with Flatpak

[TetraSource]

Before submitting an issue, please check the following

• I have searched for similar issues (both open and closed) and cannot find a duplicate
• I agree to follow the Code of Conduct

Describe the bug

Under the Flatpak version of Saber v0.25.2 when pressing the "Import note" option of the "New note" button in the start menu, no menu opens that allows you to select any file. The same applies to the "Images" and "PDF" buttons in the import section when editing a note.

To reproduce

1. Install the Flatpak.
2. Click the buttons described above.

Expected behavior

When pressing the buttons described above, a window should open which allows you to select some files to be opened.

Saber version

v0.25.2 Flatpak

Device

• Device: Lenovo Ideapad Flex 5
• OS: Linux Mint

Anything else?

No response

[jyo64]

Maybe similar to #1380