Hey team how do I change the name of the Blank.ai file so I can edit it with its own name

Hi team,

I know this should be a simple question and I should be able to work it out but something is going wrong - so I start a new project with the blank.ai file (following the adobe 1 hr long YT how to make an illustrator puppet for CA where he uses the blank template)

But I am stuck because I want to change the name from blank.ai to named.ai. If I copy the blank.ai file and paste it and then rename it to [chosenName.ai] and then go into character animator and try to get it to connect to the newly named file - it suddenly goes all warped and weird and the camera is warping the artwork instead of making it move (but its exactly the same file all I did was change the name!)

What am I doing wrong?

Thanks for your help