How can i add map to my FiveM server?

For example im trying to use this map in my server but when i add this to my server i cant see the walls and ground what should i do?
Btw im looking for a courthouse if someone have one and tell me how to add it i can use it too.

By creating a resource for maps

If you can’t see the walls or ground, you may have an occlusion issue that you can only fix using a program like 3DS Max. I’m not proficient at that though to give you any more pointers