Every Vidcast recording you create will default to display the first recorded frame as it's thumbnail within your library. The "Select Thumbnail" tab allows you to change that to any other frame from within the video, or to upload your own thumbnail.
To select thumbnail from one of the frames in the video, move the purple window cursor in the timeline to whatever frame you'd like and click save.
To upload your own thumbnail, click on Upload image button next to the timeline.
The recommended size of an image for thumbnail is 1280x720 px (16:9 aspect ratio). Up to 15MB .png or .jpg files are supported
After selecting the image for upload, you will be able to crop the image
Finally, before saving your new thumbnail, you will be given option to choose a different image, or adjust the position of the image.
Clicking on Finish will apply the image as a thumbnail to your video.
Note that after saving, you can always choose to revert back to the original via the option in the lower left corner.
Questions? Feel free to begin a chat with our support team or reach us at help@vidcast.io