Video Mixing Assistance Needed

I'm new to Cross and Vjing in general but I'm not new to using digital equipment. With that said I have not been able to fully understand how to use some of the video features within this software.
Specifically, Playing video with audio and then changing the video on the fly like in the demo youtube video on the web site. At :49 in that video it shows a person dropping a new video into the video player on the top window and the new video plays. I am unable to do that. When a video is playing I cannot just drop a video into that deck. It has no effect. The way I have been testing it seems very cumbersome.
I use 4 decks and load video in say A and the audio I want to play in C. This seems cumbersome because 1. I don't know how to make them both play at the same time and 2. I can't change the video on the fly. I do not have a controller, I'm using a Macbook Pro with Cross DJ (not free).
In the demo video I noticed the person isn't using 4 decks to do this so I believe I'm off. In that demo they have one track playing and they are simply dropping a video file in the top window and bam, new video is playing without having to click the start button or anything.
I do not have the in app video upgrade. I thought that was only used to remove the watermark.
I was going to upgrade to the full Cross but wasn't sure if that was the answer or if I need to just upgrade the in app video or if it was in the way I'm doing it.
Any help will be appreciated.
Augustus
Specifically, Playing video with audio and then changing the video on the fly like in the demo youtube video on the web site. At :49 in that video it shows a person dropping a new video into the video player on the top window and the new video plays. I am unable to do that. When a video is playing I cannot just drop a video into that deck. It has no effect. The way I have been testing it seems very cumbersome.

I use 4 decks and load video in say A and the audio I want to play in C. This seems cumbersome because 1. I don't know how to make them both play at the same time and 2. I can't change the video on the fly. I do not have a controller, I'm using a Macbook Pro with Cross DJ (not free).
In the demo video I noticed the person isn't using 4 decks to do this so I believe I'm off. In that demo they have one track playing and they are simply dropping a video file in the top window and bam, new video is playing without having to click the start button or anything.
I do not have the in app video upgrade. I thought that was only used to remove the watermark.

I was going to upgrade to the full Cross but wasn't sure if that was the answer or if I need to just upgrade the in app video or if it was in the way I'm doing it.





Augustus