problems with solid behavior

Hello there,

I have a problem with the solid behavior.

When I insert images of a non-regular shape, my character doesn't walk along the edges, but always walks inside the image. I hope I explained well my problem.

How can I fix this problem?

this is my .capx file :

link

Double click the object to open it in the image editor. Crop it so it doesn't use any more space than it has to. Then, click the collision mask button on the left. That's the collision shape for the object - make sure it roughly matches the object.