Here's how to import a presentation:
1. Create a new deck
2. Open the "Import" panel in the editor's left sidebar
3. Browse and select a PDF/PPT document to upload
It may take up to a few minutes to complete your import depending on how many slides it contains. File uploads are limited to 100mb.
Importing PowerPoint documents
If you are trying to import a .ppt or .pptx document and it's not working please try exporting the presentation from PowerPoint to PDF and importing that.