We recently made an update to allow for .mp4 videos as custom thumbnails for videos or any media item, instead of using gif files that can be large/download slow and be of lesser quality.
Some guidelines on how you should size them:
- since these are thumbnails sizing down the video dimensions to 1000px allows for the file size to be smaller
- duration: No more than a few seconds depending on the content of the video.
IMPORTANT: Remember these are going to be used as thumbnails in a thumbnail first gallery so the larger in size and the more there are the more degradation in page speed that can occur.
Steps to do this are listed below:
1. Find the media item you want to upload a video thumbnail for. You can either double click on it or select it and hit edit:
2. you should then see the panel below with the custom thumbnail upload section:
We've provided a video below on the entire process: