You'd like to open another Vocabulary Set in Clicker Communicator for iPad.

Resolution

To ensure you have the latest Clicker Communicator, please check for updates:

https://support.apple.com/HT202180

Open from iPad

Vocabulary Sets are stored in a Communicator folder on your iPad. To open one:

1. If the top toolbar is hidden, tap the black line to show it.
2. Tap the top-left Explorer (folder) icon and choose My Files.
3. In the top-left corner of popover, tap < until you see the sidebar.
4. Under Locations, tap On My iPad, and then tap the Communicator folder.

The Vocabulary Set Safe contains three pre-made Core Sets. If you select one, a copy will be created in the Communicator folder and opened automatically, leaving the original untouched.

Open from Cloud Storage

To open a Vocabulary Set from cloud storage:

1. Ensure the cloud provider's app is installed.
2. Link the app to Apple's Files app: 
   https://support.apple.com/HT206481#thirdparty
3. Follow the above steps and select the cloud app under Locations.