1. To export both a Lightroom Catalog and Smart Previews, please open your catalog in Adobe Lightroom.
2. Open the catalog you'd like to send us in Adobe Lightroom
3. Then go to "File" in the upper left of Adobe Lightroom
4. Once you're in the "File" tab, go down to "Export as Catalog". A window should pop up, and here you can go ahead and name the catalog (we recommend your studio name and the client's name).
5. At the bottom of this window, you should see 3 or 4 checkboxes. In the export process within Lightroom Classic CC, make sure that you choose the "Build/Include Smart Previews" and "Include available previews". Leave the Export negative files box unticked. 
6. This results in the creation of two files in the folder you'll zip and send us: the .lrcat file (the Lightroom Classic CC catalog), and the .lrdata file (the Smart Previews).
7. Select the folder that contains your Lightroom Catalog AND Smart Previews, right-click the folder, and select "Compress Items" if you're on a Mac/Apple. If you're using Windows you'd right-click the folder and select "Send to" and then select "Compressed (zipped) folder".
8. Take the newly created zipped folder and upload it to the link we provided. Thank you!