Hello @makeworld-the-better-one
While trying to diagnose #77 I changed the http config value to something invalid.

After that I forgot to change it back to default, and while navigating some gemini pages I tried to open a png image with the portal option. It silently failed and only after a while I tried to open another http page that correctly prompted the error (which reminded me to fix the config).

So, in summary, if there aren't any technical reasons against it, I think it's a good idea to enable modal responses (both error and info) after a That file could not be displayed. What would you like to do? interaction.