It seems to work fine for me. I think it’s usable, but it could be better, but only with involvement of the insync team, due to the proprietary nature.
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Tray icon is there and works, but it’s not the correct icon - you get the fallback icon instead (three dots)
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Autostart configured from inside insync does not work. It does not set the correct things. (there’s a workaround in the readme)
To fix 1, the application name needs to be correct, we ship it with the reverse dns name of com.insynchq.Insync which the app also needs to use internal, when talking to the system/notification endpoints. So we either need a build with a replaced app name or some way to affect that.
To fix 2, insync should use the dynamic launcher portal for autostart Dynamic Launcher - XDG Desktop Portal documentation it should work fine outside of flatpak too and should be a straight upgrade.