The feature allows you to import client source documents into Lacerte. Here is an article that explains. https://proconnect.intuit.com/lacerte/integrations/tax-import/

There is a per charge or an unlimited feature.

 https://proconnect.intuit.com/community/individual/help/importing-scanned-source-documents-with-lace...

Unlimited: $1,819
Individual: $11

Try it.

I wasted $10 or $11 on it a couple of years ago.

It was awful.  Nowhere close to the competition, and absolutely useless, as I had to correct everything.  With Intuit's development schedule, I expect a significant enhancement to it in 2032 or so.