In elementaryos 5.1 (Hera) appcenter doesnt show the downloaded flatpak apps or option to download the flatpak app. (even though I downloaded firefox and libreoffice from flathub.org)
How can I enable flatpak apps in appcenter without sideloading?
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There is ongoing work to support this. See the developers git resource: Support systemwide flatpaks I can't give a specific date as to when that feature would be ready, but I would hope it would be complete by the release of elementary OS 6.0.
Old post from omgubuntu: elementary OS Now Has Support for Flatpak Apps