The preview is a very low-resolution version of your final rendered video. Due to external dependencies, sometimes the preview may lag, be low in resolution, or show blurred images. But your final video is rendered with utmost care after going through enough checks. So rest assured that your video will be rendered with precision and quality.
However, this tool has been built by mere mortals (for the most part), and there is always room for improvement. So, if you find yourself in a pickle, please reach out to us at firstname.lastname@example.org or through the chat box in the bottom right corner of your screen. We will help you out.