If you have TrueUp activated I think the history is the result of a sync with the server. So make sure the Edge have properly synced via Connect Mobile App.
TrueUp makes your activities visible on other Garmin devices. The one which were stored on the device itself should be visible in history without syncing.
Question: You see no activity in history (empty) although activities are stored in /Garmin/Activities?
Problems that could be the reason: -you have stored about 200 activities - that’s a limit where index-problems start to occur -the date of the stored activity is in the future - check date and time of stored activity -date and time of your Edge are in the past - check date and time of your Edge -something other is wrong with the stored activity fit file.
When true up is on the edge sync back a summary file after it uploaded the ride, a notification on the edge confirms that. The history may we’ll be on that one rather than the large recorded fIle. And indeed the edge as a 200 limit that it manages itself normally but that process is not error prone. I regularly just delete all recorded rides. They are in connect anyway.
