You likely have "Folder View" off. In the Custom Game menu, ensure the dropdown at the top is set to "All Maps" or navigate correctly. Also, check if the file extension is .w3x and not .w3m (Reign of Chaos map).
: The community around custom maps is active, and updates are frequent. Keep an eye on forums and social media for updates to the map. Dota 7.03 Ai Map Download