Files can be "attached" to a events. Attached files can are accessible by all Planners and any Helpers that are scheduled to serve at that event. Keep in mind, song-related files should probably be attached to the song (in your Songs Library), not directly attached to the service.  Examples of files you might attached to a service include: slides for the message, imagery to be projected on the screen before/after the service.  To attach a file to a service:

1. Go to the Event Flow of the desired event

2. Click the Files tab

3. If you have not yet uploaded the file, you can drag new files to upload. If the file has been previously uploaded (either by you, or another Planner), click the "Attach previously uploaded file" button, and use the search interface to find the file

4. Click Done once the file is selected or uploaded