To add photos to a drawing, 'Read Only' or higher permissions on the project's Drawings tool AND 'Read Only' or higher permissions on the project's Photos tool. Note: Users with 'Read Only' permissions to the Photos tool can only select photos that already exist in the Photos tool, while users with 'Standard' or 'Admin' permissions can also add new photos.
Photos added to drawings will also appear in the Photos tool in a 'Photos from Drawings' album. The 'Origin' field on the photos will indicate when a photo was uploaded from the Drawings tool. Note: Photos from a markup will only show in the 'Photos from Drawings' album if the markup has been published.