In the Rules Reference, under Explore Action it says "An Investigator can perform an explore action of an Explore token only if he occupies the same space as that token or a space adjacent to the door the Explore token is placed on ."
But on the Quick reference on the back it says: Explore Action: Investigate an Explore token in your space using the app.
The first rule implies that the explore action incorporates movement within it, which is reinforced by the fact that most of the time you also get to move one space into the room. The later requires spending movement and splitting the move action.
Can an Investigator explore a door from an adjacent space and still have a second action? Or does such an action also require taking a move action, thus ending that investigator's turn?