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Smart previews allow you do edit your images when the original files are not available, like when they are on a disconnected external drive.
However, when you want to export the edits, or "export as catalog" with the images included, you need access to the original files.
Thanks so much for trying to help!!!
It basically says "smart previews could not be generated" when Im trying to export this catalog
I've done it once before successfully and cant think of a reason why this would be happening.