I have Window 11 DeskTop PC and Movie Studio15.
As you know when you make a video you Import Video Clips but then you Cut the Video Clips to the parts you want.
Now if you Save As the Project will be saved to a Folder and at the bottom of the Save As window you can even put a check in Copy Media with Project.
This will Copy the media so you can Delete the source media.
This is good but the media it copies is the full Video Clips you Imported not just the parts you Cut it down to in the Timline.
So let say I have a video clip of a Bird going into a tree but then the tree starts to fall.
I would Import this whole video but in the Timeline just cut it to have the Bird going into the tree and cut the tree falling out of it.
Now if I go to just save the project it will copy the whole video clip even the part with the tree falling.
Even though it only show the part in the Timeline with the Bird going into the tree and this is it.
PS
I know I ask something like this in another post and I chould not find it to as this in it.