When you upload photos to an activity, Strava highlights one photo in the feed - either the photo you designate as the highlight photo or the first photo taken by your camera. If you prefer to show the map instead, you can set your preferred default highlight image in your settings. Visit the Settings menu on mobile and look for Default Highlight Image. Tap the setting to toggle between Photo and Map. On the Web, the default highlight image setting can be toggled by visiting the Display Preferences tab of your settings.