How to show thumbnail preview in node display for uploaded video in file field I am using a file field and media module in a custom content type to upload video files. The videos play fine.  The preview image for each video is a gray box.
How can I display a preview image or thumbnail for each video in place of the gray box in the node display?

Update: the preview image does not have to be auto-generated from the video; I would be OK with adding an field for an image to upload along with the video.
Go to your content type >> MANAGE DISPLAY settings and set FORMAT as Rendered file and view mode: perview