This isn't available in PowerPoint GUI (unless you count copy & paste from
the properties!)
It's fairly easy via vba though to access the properties and add them to
slides
eg
Dim sAuthor As String
sAuthor = ActivePresentation.BuiltInDocumentProperties("Author")

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> Hi, I want to insert document properties (as title or file size) inside a
> presentation.
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>
> Thanks in advance.