[HELP] Converting ymap to interior

Hi guys. For the past days I’ve been trying to figure out how to stop the rain coming through an ymap addon, this one: https://www.gta5-mods.com/maps/og-race-shop-v1-0

The problem is, I have found this tutorial: [How-to] Map an interior and stream it in FiveM

Which is really unclear to me. I understood that I need to create an mlo file to stop the rain from going through the walls. I also found a topic where someone said you can add an interior to an ymap. Could I just use Menyoo to add some roofs or what should I do? If anyone can explain it to me, I would be very grateful.

Did you ever manage to figure it out? It’s ridiculous to me how fucking complicated they make it to be to convert these YMAP/XML maps/interiors into useable MLO’s.
All I end up with are useless xml files, ZERO YDR, YMAP or YBN files.
Just useless xml’s.