For our Color Correction service, there is the option to send a Lightroom Catalog and Smart Previews. Keep in mind that if you select this option, we only need the Lightroom catalog (.lrcat) and Smart Previews (.smartpreviews.lrdata) files.
When you export your catalogs, click only the box that states Build/Include Smart Previews
This will give you a .lrcat file (LR catalog) and smartpreviews.lrdata. These are the only two files we need.
Put those in a folder, zip the folder and upload to dropbox.