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Can anyone suggest how to change a file from jpeg to pdf ?
You can't do that in Lightroom. Why would you want to do that anyway?
You cannot "change" a file but you can create a PDF document with photos-
From Lightroom-Desktop v4.1 (on a PC or MAC) you could-
1) Export the photos to a local folder
2) In File Explorer/Finder Select the photo, or multiple photos, and 'PRINT' to a PDF.
Windows-10 can do this easily by selecting the Printer that is "Microsoft Print to PDF"
Macs TBMK have a printer dialog check box that will 'print to a PDF'.
I do this regularly to distribute my photos in a single PDF file that can be used in presentations.