Changing the video Thumbnail Photo/ poster frame

I have to use dropbox for video, so I really need to know. Please someone from dropbox answer!

bump.
I'd also like to change the thumbnail of video files if possible.

I like to change the thumbnail of video files if possible.

There's no way to change the video thumbnail. Dropbox determines it on its own (it's a frame from approximately the 8 second mark).

+1 on this, cients request changing thumbnail but there's no good way to do this - it would honestly be better if it didn't even set a thumbnail at all. Any updates on this one as we approach 2018?

This is outrageous that you can't pick a thumbnail. I paid extra money for the "Showcase" feature, thinking it's common sense you could pick your own thumbnail, but I still can't. I can't even hide the image. This is very very high on my priority list.

Seconded!

This is bad. I want to share videos with clients, but when they see the thumbnail set, they can't recognize the video. I've tried setting the poster frame, but DB ignores. What to do? 

I agree. As a video producer it's very frustating for Dropbox to arbitarily set the thumbnail image. I often get requests from clients to change it and I always blame Dropbox. Not good for Dropbox's reputation.

Please provide this custom thumbnail option. As a freelance video editor I prefer using Dropbox to share video edits with my clients but they constantly complain about the poor choice of the video thumbnails which I have no control over. I've had to explain to them numerous times this is an issue with dropbox not providing a custom thumbnail option and not my own poor taste in selecting an image (it's very embarassing as a professional to receive a note that the thumbnail I selected was the 'crappiest image I could possibly find'). One client is now demanding I use another service to share video edits.