When taking a picture of a "Gate" (the big blue thing with a number on it), the game will show how many "Secondary Targets" needs to be "destroyed" in order for the "Gate" to be unlocked
Taking pictures of Gate Confirmation
Source: Steam Community (opens in a new tab)
Build and release context
Recorded Steam release date:
Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.