Use case:
I read from a database that contains partial filename strings, e.g. "ABC123". I then need to go look in a particular folder for files that match that pattern, e.g. "ABC123_alpha.csv", "ABC123_beta.csv", etc.
I have added the Input Data tool and am querying for the partial filenames, and I added a Directory tool and pointed it at the correct folder. How can I take the partial filename from the Input Data tool, and use it as the "File Specification" pattern in the left-sidebar configuration of the Directory tool?