DRAWings 6 PRO - Imported Files

Hello,

Well this is the first time i'm working with DRAWings, im still learning how it works, but one thing i don't seem to understand is how to import files with transparent background. I've tried importing as TIFF, PNG, CMX, but it always have a background wich doesnt help me because when i select Trace - Convert to Outlines it renders the image with the background. I've seen some tutorials on YouTube but none of them explains this. How do i do it?

Thank you in advance for the help.