Why not use a separate LR catalog to begin with? Then import the missing Aperture files. To create a fresh catalog; on the top LR menu click:
File >> New Catalog
Choose a new name and save
When the empty catalog opens you are ready to start the import from Aperture.
If successful’ you simply switch back to your main LR catalog and import the new catalog to give you a combined catalog.
The beauty is that you can switch between the two at any time. You can also check for duplication e.g. projects converted to collections where there may be overlap. Or you can even export one folder at a time and import into the combined catalog, if you need more control.
Make a backup of your current LR catalog before you start.
I like that idea a lot better. Thank you!
I don’t know whether you are using any smart collections, but you may wish to delete all the smart collections from the temporary catalog before combining both; so that the import doesn’t overwrite the existing.
Just so I'm clear - are you talking about smart collections in the temporary "files that were offline" library in Aperture, or in the catalog (either the existing one or the new one I create) in LR?
I'm talking about the new LR catalog you create. It's just cleaner, in my experience to get rid of them before importing into your big catalog.
Got it. Thank you very much once again.