There are two ways for you to add a video layer (PiP) to the canvas (the same as adding an image layer).

First, in Media or Video, click the Add as Layer button on the lower-left corner of the video to add it as a layer.

Second, drag and drop the video to the center of the canvas directly.

Currently, you can add unlimited video layers to a scene. However, adding multiple video layers may cause instability problems. So, we recommend using computers with 8GB+ RAM to create projects with multiple video layers.