As with repeatable sections, apps with record links contain reference
fulcrum_id values for the linked records.
In the file that contains your links, you will find a column (titled with the data name of your record link field) that will contain record IDs. If you enabled multiple records to be linked, the column will contain multiple record ids that are comma-separated. These IDs will match up with the IDs located in the
fulcrum_id column in the files that contain data from the linked app exports.
When you use the downloader to export your data, you will have the option of having the record link field contain the record title of the linked record or the record ID.