This confused me at first too, but here is the solution:
- When you use the uploader, select and upload the file you want the end-user to receive (this is the full-res video with no sound).
- After it has finished processing you will see the auto-generated preview video (with the watermark applied) on the left and a set of auto-generated preview images on the right.
- To replace this preview video with your own (for example: one with music or perhaps instructions), simply click on the preview video and select “Upload new video” or “replace video” (or something like that, I can’t remember off the top of my head).
- Now you can upload your specific preview version of that video with sound, etc. But make sure it doesn’t contain a watermark because it is added automatically for you once it is done processing.
The system is smart enough to know the first file you uploaded is the one the customer gets, and the new file you uploaded to replace the auto-generated preview your custom preview video.
Note: you can also set a custom preview image as well at this stage (after the auto-generated preview images are completed). You cannot set a custom thumbnail at this stage though. To do this, you need to wait until it is published and then edit it with a new thumbnail.
Hope this helps.