Sorry if it’s too dumb or obvious but I’m having a hard time discerning if the following options means “download TO Strava” or “download FROM” Strava (or the same for uploading and also for other platforms):
Download activities means to “get (completed) activities” from Strava, Garmin, Suunto, Polar, Wahoo, etc.
Upload planned workouts (Garmin, Suunto, Wahoo) means to send the workout from Intervals to your (Garmin/Suunto/Wahoo) account, to complete the workout on the device.