Remote Textures

Could someone help me and tell me how Remote Textures work?

Navigate to ROTMGServer-master\Texture Grabber\bin\Debug and open the application.
Search anything.
Click on the texture you are looking for.
You will see a number under a picture of the texture.
That is what goes here:
<RemoteTexture>
<Instance>draw</Instance>
<Id>NUMBERHERE</Id>
</RemoteTexture>

Does it also work for selfmade textures?