@zerodogg If you need help with appstream metadata, I am happy to help with that. Otherwise, not being a (flutter) developer, the best I can do is point you to other flutter apps published on flathub - just looking at how others do it is often helpful IMO. https://github.com/flathub/com.adilhanney.ricochlime/tree/master would be a recent one, using the latest freedesktop runtime.cc @flathub