You create a new DataStore of type Adapter, select the JobServer and our SFAdapter Instance. In the "Advanced" property panel you choose the directory where all the files reside.
One the DataStore is saved, you can rightclick and select "Open" to see a list of all files. Maybe it is a good idea to put a few files there, just simple CSV files. You can select some, rightclick them and say "Import".
Or, from the DataStore you open the "Import by Name" dialog so you can specify one file to be imported.
Either way, you end up with a table like the Adapter told, including the MetadataResource property we used, the FileNode.