Add Reveal in some points on the Map

I would like to add a reveal using a custom image to show the party when they reach specific points on my map. I can add a kind o button/sticker and upload my custom imagem  where I need on my Map and then reveal this image to the party.

For example:

In Hall A, on the south wall of my dungeon, there is an image I want to show the party when they are standing in front of that wall. The image contains clues for a future puzzle.

In Hall C, there is a secret door. When my group finds this secret door, I want to reveal another image featuring a puzzle; to solve it, they will use the clues they found in the previous image on the wall.

Thanks!

Custom Reveals are being actively worked on.

WOTC_Zac:We're working on user uploaded reveals now. In the mean time, you can homebrew something, use the image as the monster's avatar, add the token to the map (as hidden from players) and use the monster reveal feature. That's a workaround the community discovered!

https://www.reddit.com/r/dndbeyond/comments/1tswy9n/comment/ooy90aq/