Preload library


I have a stupid question maybe but it’s the first time a think about it :
In my fla i have MC that i attach to my scene whenever i need em. I have pictures on these movie clips and it’s possible not to add the mc on the first frame so the mc is not loaded at the beginning…if i understoof everything well. My question is can i preload the mc i attach on my scene ? and how to do it ?