Can not play role of collision for use mesh of type?

First,i upload a model to PlayCanvas and i set collision type as box.Then i found if i set box type,model’s collision size is not equal to a haft of model size.

For examples:

Final,i set collision type as Mesh,although collision size is fit model,but model’s collision is not working.Need i set any other parameter?

Thank you for your time.

When you export model to FBX using your modeling tools, you have to set right scale so that you have 1 meter to 1 unit.