If you'd like to customize your video to make it as unique and attractive as possible, we definitely suggest you upload the custom trailer. Change the automatic thumbnails so visitors will want to purchase a subscription as soon as possible!
Here are the steps for the trailer:
Choose the video you'd like to use or upload a new video in My Site > Videos;
2. Click on Edit video preview;
3. Choose Trailer and Upload custom preview;
Wait until your trailer will be uploaded and processed, then click Apply. You can click on the Apply button while your trailer is being processed.