I created a test catalog with a few hundred RAW files in it. It is save on dropbox with smart previews. The catalog was created on my windows ws at the office. When I came home I opened the catalog on my macbook. It opens with no errors and I can view files in the Library but if I click on one to zoom full size, it is blurred. If I try to go into develop which should work, a blurred image shows up and the overlay says "The file could not be found".
I checked the catalog properties and it says there are 19mb of smart previews. I can see the xxxxx smart previews.lrdata file in the same directory as the catalog. It just doesn't seem to be working. Is this supposed to work across platforms?? Can catalogs with smart previews be opened on the "other" platform from what they were created on?? Hmmmm..
Smart Previews only work on Mobile Device for Preview your original files from Lightroom desktop.
You need to locate the missing images in the catalog to get rid of the message "The file could not be found".Refer Adobe Lightroom - Find moved or missing files and folders
Can catalogs with smart previews be opened on the "other" platform
These smart Previews lets you edit and view your iimages when original images go missing from Lightroom but this is possible only on the same Platform and computer.