Is it possible to add extra content to the Custom NPC mod on the server?

Is it possible to add extra content to the Custom NPC mod on the server?

Hello

I am new to this platform and with respect to the "Custom npc" mod for 1.12.2 that is perfect for me, I wonder if it is possible to add a content package "textures, skins, sounds" customized for my server modified in forge. I note that in the Aternos modification folders there is no "customnpcs" folder that has the function of allowing you to add your own content and use it with the mod on your server.

Is there any way to access this folder and add this content or to access the other folders on the server?

Thanks for your info,.