Apply dropdown filter data source on several reusable element (SPA)

Hi everyone,

I’m new on bubble for few weeks now and it looks quite impressive so far !
I’m working on a projet to create animals profile and I’ve been advised to create Single Page Application (SPA)

So far I’ve created two reusable element “formulaire” and “document”.
I’ve put a dropdown to select which Animal profile has to be displayed (according to unique ID so far), but I’m struggling to send data source to each different reusable element so it can display the data of the selected animal

I’ve read a lot on custom set and I guess it might be the best way but I’m still struggling with it, would you have any recommandation ?
Many thansks !