Map selection problem

What format are the non-working maps in, and which maps + where are you getting them?

Link 404 error. . . . .

such as:
red_comet.sd7----file list：
red_comet.smd,red_comet.smf,red_comet.smt
changemap--the maplist can find.

onyx_cauldron_1.8.sd7----file list:
folder：LuaUI ，mapconfig，maps
file：mapinfo.lua,mapcredits.txt
changemap--the maplist can't find.

Chobby--mapwhitelist.lua
not find onyx_cauldron_1.8

I understand that adding too many maps to the map list can increase the server burden, is that right? But I found a way to manually select the map to play: Open the map list from the site to find the map you want to play, select "PLAY ON THIS MAP", so you can select the map you want, but only for online games , Stand-alone mode is invalid.