Get the MacBook up and online ASAP when you arrive. Large videos in the presentation can take a little while to sync. Syncing is currently done with pCloud. To sync:
Open ProPresenter and on the top menu, click ProPresenter -> Preferences...
On the window that pops up, select the "Sync" tab.
Click the "+" to the right of the Repository path box.
Click pCloud in the left sidebar and navigate as shown select the folder called "___ProPresenter Sync"
Make sure all boxes are check in the "Include in Sync Service" section
Select "Sync files down from repository
Check the "Replace My Files" box.
Click the "Sync" button and wait for it to complete.
After the Sync completes, close the Preferences window (red button in the top left of the window), then in menu at the top of the main ProPresenter window, click "ProPresenter", click "Quit ProPresenter", then click "Ok" when prompted.
Restart ProPresenter for your sync change to take effect.