To give context of where in the game my question comes into play: When you go to Hateno tech lab, after lighting the blue flame, Purah uses the pedestal to download the Camera Rune, which comes with 12 ancient pictures already taken. After that, you can upgrade your Sheika Slate Seeker to the Seeker+, where you can track items in the Compendium.
After doing the Seeking Sunshrooms sidequest for Symin, when you talk to him again, he says something along the lines of upgrading your compendium (or your slate) to allow something related to helping you find the locations in the ancient photos.
He puts your slate in the pedestal again, and it does the download thing again. A messages says (I think) "Hyrule Compendium updated". Purah says that from now on she will have to charge you to do this. However... after this happens, I can't see any difference in the camera or the compendium! There are no new compendium entries; only the ones I had manually taken pictures of. No ability to use the seeker+ to find the ancient picture locations or anything.
What was it that was downloaded to the Sheika Slate when Symin puts it in the pedestal?