Syncing smart previews with originals after editing in Photoshop

Agreed. When you tried to edit the images in Photoshop and couldn't, you should have stopped and asked yourself why. Or perhaps should have come here at that time and asked us why. Exporting the images and editing these smaller exported files in Photoshop created new, smaller Photoshop-files. There is no way to 'sync' these back to the originals, and the question is what that 'sync' would be anyway. A Photoshopped image is a new tiff or psd, not the original raw file with Photoshop edits, so your current situation is not all that different. The only difference is that your Photoshopped files are smaller, because you started from smart previews. If you can live with that then there is nothing you need to do, if not then you'll have to do the edits again starting from original raw files this time.

Under normal conditions, when working with smart previews from Lightroom the option to edit in Photoshop will not be available. The master images must be available for that option should be used. I don't believe providing you with just smart previews is going to be a viable option if you are planning to use Photoshop as part of your workflow. It would work if you were only planning to use Lightroom, but if Photoshop is an integral part of the editing process then the master images are going to be needed. In the event that the master images are raw images, any performed in Photoshop will NOT be applied to the raw file. When the work is completed in Photoshop a new file must be created. Consequently, any work performed on a smart preview would not apply to the file anyway.

Moving post to Lightroom forum.