30mo can either be a short and small size video that is lightly compressed (best case scenario) or a long and big size video heavily compressed. Latter case can lead to a non ideal result to to recompression of an heavily compressed video.
Note that the video feature offered by Webflow is a “background video” one, not a video player one. Difference is the bg video is used as a decor for somethingelse and the quality is of secondary importance, bg video are often overlayed by a texture, or with washed out colors, or very short with a loop…
If you want to show a very nice video, you rather need a video player, so a HTML5 video technique (custom ccode) with a MP4 video hosted somewhere. As long as the url of the video works by itself in a browserr, the code will work.
So yes we recommend you use custom code if it’s your case.
Can you share the custom code you’re already using and that works in Preview? As well as the url of the page, and your site’s read only link.