Click the Pins icon on the markup toolbar. Note: If you do not see 'Pins', another pin markup option (such as Photos, Snag or Issue) may already be selected. Clicking any one of the pin options will expand the options to show Observations.
Select the Observations icon.
Click the area of the drawing you want to add the observation to.
In the Link an Observation box, begin typing to search for the observation you want to add. Tip! Double-click to bring up a list of all the observations in the project that you have access to.
Click the observation that you want to add to the drawing. Note: The colour of the pin denotes the status of the observation.