Track Matte problem

[JimmyPage11]

Hello

I'm trying to Track matte a layer but it seems cropped and scaled down. Shouldn't it assume the shape of the object?
Attaching two screenshots. 

Please help

Thanks

  

[Peru Bob]

Your media must match the sequence settings for it to work properly.

[JimmyPage11]

It is a photo. Can you please be more elaborate?
Thanks

[Peru Bob · Accepted solution]

The pixel sizes of the photo may need to match the pixel sizes of the sequence for the track matte to work properly.

You may need to nest the photo if the photo doesn't match the main sequence.

[JimmyPage11]

Thanks so much Bob. It worked. But can you please tell me why nesting solved the trick? is it because the nest mimicks the sequence settings?

[Peru Bob]

Yes.

[PaulMurphy]

You need to use an effect other than Motion to scale and position - this video explains it:
https://www.youtube.com/watch?v=j2speTWY87g