Did the source column for a LinkedIn jobs import change? It doesn't seem like I'm able to select a different Clay table as the source for company linkedin URLs other than the current table
So if you trying to add from within a table it will use the current table as the source point. If you want to add jobs from a different source you can create a new table for Finding LinkedIn jobs and then import the results to your existing table.
I would recommend making sure you turn off your current table though if there any integrations. As adding new job sources may trigger the columns to run automatically and spend credits.