I am a new user of Gramps on a Linux system. I imported a large gedcom file containing my research over a number of years.

When I generate a report requesting sources to be displayed, the sources are displayed.

However, if I want to edit an individual's record, I notice that the Source tab window is empty, showing no sources for the records I have on that individual.

How do I get that "imported" source information into the individual record, short of doing it all manually, which in my case could take a considerable amount of time with thousands of individuals involved.

Thanks in advance for any advice.