jafletch, I appreciate the video preview thumbnails and full length video previews. Thanks!
On Tumblr, a user's Archive page ( username.tumblr.com/archive ) is one of the most useful ways to browse their content, however for synths shared there, currently nothing is shown beyond the fact that it is a Video post. (A default grey thumb is shown with a Play icon.) This isn't so helpful for distinguishing between posts if someone has shared multiple synths.
I'm not sure if Tumblr allows a GIF thumbnail for video posts, but even if you could get the beginning photo to show as a single thumbnail underneath the Play icon on the Archive page (as seen in posted Vimeo and YouTube videos there), it would be an improvement over the current situation.