Let say a have Flatpak apps “AAA” that want to open a PDF reader for reading documentation or what ever, how do I do this? Do I have to include that PDF reader into Flatpak apps AAA?
But if I already have Flatpak PDF reader installed? Can I make AAA call external Flatpak PDF reader instead?
Let me know if this is off-topic.
If the application you want to use isn’t a standard one, it has to be included in this application’s Flatpak environment. I know of no way of doing that - apart from compiling the whole thing as part of this Flatpak.