New: preview your video before you publish (YouTube Studio)

A Preview button now sits beside "Undo changes" on a video's details page in YouTube Studio, and beside "Reuse details" when you upload. It shows your video the way viewers will meet it, using the title and thumbnail in the form, even before you save them.

• Home or Suggested: see your video on the home page beside the videos YouTube recommends to you, or in the suggestions beside a video like yours.
• Every screen: phone, tablet, laptop, desktop, 1440p and TV, in light or dark, or drag the edges to any size.
• Try before you change: test other titles and thumbnails inside the preview. Nothing is saved to Studio.
• Shuffle your video's position, or highlight it to find it at a glance.
• Works in the upload dialog too, with Studio's default thumbnail when you haven't set one yet.

Also in this version:
- A new Studio tab in the Toolkit settings lets you turn the preview off.
- A short introduction shows the new feature once after updating. You can see it again from Settings → Studio.