1. Open the QR generator spreadsheet.
Then open Your Google Drive and click the file you want.

2. Find and click the paper clip

3. Usually that automatically copies the URL.  IF not, highlight the url and copy it.

4. Go to the spreadhseet.  Right click and choose Paste⌘V.

Or, use ctrl + V to paste in the QR Code column.

5. Right click on the QR Code.  Click Copy⌘C.  Paste the QR code in the document or place you want it.

You're done!

Interactive tutorial