Does require() only work if the Module is in your inventory? [Unsolved]

I was wondering if anyone can tell me if the require(assetid) function only work's if they have the MainModule part in their inventory, cause I give my friend's a require(assetid) and it won't load for them but it load's for me.

require(assetid) will work for any item on Roblox, although:

• The item must be a modulescript
• The item must be named "MainModule"
• The script require'ing the module MUST be serverside, and it has to be a script (not localscript)

require(In-game module) will work on any modulescript, regardless of name, location or script-type.

In studio, require'ing the assetId will only work if it's in your inventory. To properly test it, it must be run on the server.