XnView Software

So I will answer my question by myself: just removed the flatpak version of XnView and installed the AUR version in Manjaro and now it works as desired. No obscure temp folder will be used any more and viewing back and forth works perfect. So the temp folder thing is just a flatpak "problem". Would ...

Hello :-)
I have the same problem. Just installed XnView MP in Manjaro Linux as a Flatpak package. Runs wonderful but registered a s a default app for images - because ist so blazingly fast ;-) - the problem is that only the clicked image is seen and there is no option to see the next or before ...