You can go to your Library window, select any of your shared folders & look to the columns to the right. Hits will tell you which files were found in other people's searches, & uploads column will tell you which ones were uploaded fully or partially or distrupted.
If you want to increase you sharing, enable partial file sharing. That means people will use some parts of your files whilst downlding from other people.

Thanks again, I have done what you said. The hits column shows plenty of hits but all upload columns are showing 0/0.