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Android. I have only posted through it a few times; usually I forget to open it in the morning and it doesn't track anything if I don't.

Yes, that ruined things for me today. I got mad to a point that I uninstalled the app. The iOS app uses apple health for the data so its there no matter what, but AAAARRRRRGGGGHHHHHHHHHHHH. No way I'm gonna remember to open it every morning, especially on busy days.