The clue bag is not accessible until step 10 of the quest (interact with the clue bag). You can only pick up the clue bag after finding and taking a photo of it, talking with Merida, and moving to the area near the giant horse statue. Step 6 (find the clue bag) and step 7 (take a picture of it) must be completed while staying within the designated interaction area for step 6 (near the giant horse statue). If you leave the area before finishing these steps, the quest may reset to step 6. If taking the photo does not register: If possible, please complete step 6 ("Search for the next clue under the wing of 'a giant flying horse' ") and step 7 ("There's something tucked under the flying horse statue's wing... Take a picture of it.") at the same place or without moving too far away. Also, don't worry if the clue bag seems to be located in an unreachable place. A princess with curly red hair will help you reach it!