What are the finishing touches on a clip?

They are the optional extras in the clip editor, on the tab each belongs to. Everything goes into the clip file you download:

• Title on the video (Captions tab): a line in a white box at the top, for the first 3 seconds or the whole clip. Click a suggestion to use it, or type your own.
• Progress bar (Captions tab): a thin bar along the bottom that fills as the clip plays.
• Sound (Finish tab): Even out volume brings the clip to a steady loudness. Cut long pauses removes silences longer than a moment.
• Also make (Format tab): the same clip in more shapes. Each shape is another clip in My Outputs.

The Caption to copy, on the Finish tab, is not in the file. It is text for when you post the clip yourself, and it shows in My Outputs with a Copy button. Podspun never posts for you.