I would like to know how to import custom models in the route editor like what files to export from 3ds max and where to put what folder for the model
As the editor is based on Unreal Engine 4.26, standard UE tutorials apply. Have a look at the ones here and find one that works well for you. https://www.youtube.com/results?search_query=Import+3DS+max+models+into+Unreal+Engine+4 Regarding folders, whatever content you make, you need to make your own Plugin for this in the editor. If you want to get an idea on best practice for the folder structure, just have a look at the existing content you can see in the editor.
