Yeah!! I definitely had a feeling that I had to inverse SOMETHING in the end… Thank you VERY MUCH for that in depth answer!!
I ended up creating a null, parented my initial footage to that, applied my tracking data to the position of the null, and copied the tracking data to my anchor of the initial footage (that’s the child of the null).
Many many thanks! I think the footage I took wasn’t all that great considering how it was of in a videogame engine and I need to get a better capture of it, but I think I “mastered” what I wanted to do.