I'm apparently entitled to unlimited storage with Amazon (Prime Photos) and I've uploaded all my DNG images (about 20GB) to their "cloud". When I view them online, they are tiny. Apparently that's because when you upload DNGs, Amazon displays the embedded JPEG preview.
What's the proper way to regenerate all the previews (preferably with my corrections) in Lightroom 3? I found some guides that appeared to do something, but from what Exiftool is telling me, the original camera previews are still being used. These are small and totally not color-corrected.
For what it's worth, the photos were originally imported with Pentax's RAW format and I later converted them to DNG, not sure if that's what's preventing the re-creation of the previews or not.