Markers can only be viewed in the 2D track view on the Debrief page. To view Markers, follow these steps:
STEP 1: Select the Post-Flight tab on the bottom right corner of the app.
STEP 2: From the Post-Flight page, select the Flights button.
STEP 3: Select the Debrief tab for the flight that has the Markers that were added.
STEP 4: Select the 2D View, and the Markers will be displayed where they were added.