How do I import my activities from AllTrails?
You can request a file containing all your AllTrails activities at the AllTrails Privacy Center. Select Make a Privacy Request and then Download all my data. AllTrails will send you your file via email — sometimes this can take up to 30 days. When you receive it, simply upload the file to List Hiker.
AllTrails sadly does not allow other services to synchronize recorded activities in an ongoing fashion. One workaround is to redundantly track new activities with Strava (or another service, such as Garmin Connect, that syncs with Strava).
Another workaround is to download individual GPX files after each activity: on alltrails.com, hover over your profile at the top right and click Show Profile, click Activities, select the activity, click the ••• above the activity title, select Export route file, and save the GPX file. You can then load the GPX file into List Hiker.