I take internal representation to be an aspect of "embodiment", which you could also call the experience of being in the first person. If some idea is being represented internally, then it is being experienced, and the sum total of all these different experiences happening together (seeing, hearing, thinking, feeling etc..) are what you could call "embodiment".

I think philosophy is a difficult subject partially because people use different terms, or sometimes their own unique terms, to describe subtle and complex ideas.

When I mentioned embodiment, I was referring to the experience of being in the first person while feeling hot or cold, seeing colors and objects, hearing the sound your keyboard makes when you press keys, feeling the keys with the tips of your fingers, etc. All of that together at once.