You can now upload your Powerpoint, Word, Excel, PDF, Photoshop, Adobe Illustrator, and Open Office files directly into your slides with our new Documents integration. 

To upload your own documents, you can select the My Docs icon in the slide editor. From there you can choose the file type then select your document.
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Once you document is uploaded and inserted into your slide you can set the duration for each page to display in the document.