Use the associative data import to add keywords, speaker photos, or media items to existing content that you imported from other sources.
In order to associate media items, ensure that you first import or create the media items in the CMS > Media.
Then set up an import source in the Step 1 > open the Advanced section > and toggle Associative Data.
Import a table with only two columns: the first column with the session ID (this column must be unique) and the second column with the media ID (if multiple, comma separate them and use double quotes for the cell content).
Session ID,Media ID
In the Google sheet, your table would look like this:
|Session ID||Media ID|