In addition to the catalog we will also be needing the Smart Previews file. You will find 2 files alongside your Lightroom catalog file, Previews and Smart Previews. We need the Smart Previews (see photo 1).
If you do not see the Smart Previews file, don't worry, it's easy to create. Simply open your Lightroom Catalog and select the photos you are sending us. Next go to File>Export as Catalog (see photo 2).
Once the pop up menu opens, name your project (preferably to something unique so it does not overwrite your previous catalog). Make sure "Build/Create Smart Previews" is selected and click Export Catalog. (See Photo 3)
Final step, find the new Lightroom catalog and Smart Previews you just created and upload them for us using the same link as before.