It is not possible to transfer the same video file in a YouTube channel. You have to delete it first from your YouTube channel and then re-upload it.
To re-upload videos on YouTube, proceed as follows:
- Click the [Re-Upload] button of the YouTube channel you want to upload the video to.
- A pop-up asking you to confirm the deletion of the video from your YouTube channel will appear.
- Tick the checkbox for confirmation.
- Click on the [Re-Upload] button.