How to add picture to checked picture placeholder in AI template

Hi guys, Im in AI and using a downloaded template for a flyer Im making. The template has a checked area for a photo to be inserted, and I have successfully added a picture to this area previously...but dont know how I did it and now cant replicate that! You can see the checked area in the screen shot below, and it has an angled edge that automatically shapes my rectangle picture to this same edge shape. When I 'place' an image there it just pastes as a rectangle shape and I cant trim it to match the shape of the checked area.

Does anyone know how I can paste my own picture in the checked area so it automatically takes the cheque shape and shapes my pictures edge to match?

Thanks heaps if you can help.