I imported an outline and it doesn't look right.
Remember that PowerPoint imports an outline from another application "as is." Before importing, be sure that the existing document makes a suitable outline. For example, importing a lengthy text file or detailed spreadsheet might not make sense as an outline.
I demoted a slide and the text moved to the previous slide, but the notes and graphics disappeared.
When you demote a slide using the Demote button on the Outlining toolbar, the text content remains and carries over to the previous slide, but any graphics or notes are deleted.