Presenting: Sensor +! Walkthrough

First things first, make sure you've wrapped up a few other key side adventures: 'Regional Phenomena' (you only need to complete one temple for this), 'Camera Work in the Depths,' 'A Mystery in the Depths,' and the 'Hateno Village Research Lab' side adventure. Once those are done, head over to Robbie.

Chat with Robbie and select the 'Presenting: Sensor +!' option to kick off this side adventure. He's going to ask you to gather information on five different monsters by taking their pictures with your Camera.

As you explore Hyrule, keep an eye out for monsters. When you spot one, switch to your Camera. If the monster's name appears in orange, it means it's a new entry for your compendium, and taking its photo will count towards Robbie's request. If the name is in blue, you've already got it, so no need to snap another pic.

Your goal is to photograph five *different* monsters that are new to your compendium. It's a good idea to try and get these shots from a safe distance so you don't have to fight them immediately.

Once you've successfully photographed five unique monsters, return to Robbie. Show him the data you've collected, and he'll install the Sensor + upgrade on your Purah Pad.