Hello,
I recently install XnView MP flatpak instead of my old appimage and installed versions.
It works, but inside I can just see the SSD with the OS install, I can't see other hard disks and partitions (where my personal datas are).
In my file explorers, these disks are inside "mnt", but I find them nowhere in the XnView file explorer.
(I have try too with hides files activate)
In XnView, if I choose "open", I can see the other hard disk, and open one file. It is in "/run/flatpak/doc/54b3c569/"
If I choose" open a list of files", I have black vignettes with symbols instead of text titles of picture.

When I try to open pictures from a file explorer to XnView, it open each picture file in different folders (name with numbers like "/run/user/1000/doc/99c20088/", one file by folder), but I can't open a whole folder of pictures in Xnview with all pictures inside.
(I prefer Flatpak, because appimage is not integrated in the OS menus)
Maybe it's a XnView specific problem than a Solus problem...?
thanks if you can help