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The scanner will feed the document through. Once the document has stopped moving, your scan is complete and is already saved to the location you specified (You will know this once the scan shows up in the preview screen with a circle in the middle). Press the up arrow in the side of the machine to help remove the transparency sleeve.
If you are scanning multiple documents, you can remove the old document, feed in the new one, change the name of the file under the "Output FIleFile" tab and hit 'Scan' again.
If you have any issues removing your document from the scanner, you can press the UP ARROW button on the large format scanner to push the document through.