The Yi Jing app supports automatic syncing of your journal across all of your devices,
For syncing to work, both devices must have iCloud enabled, and also have "Use iCloud" turned on for the Yi Jing app on each device. First, confirm that iCloud is turned on. Open the Settings app, tap iCloud and confirm that the Account that appears there is the same on both devices. Then, select iCloud Drive and confirm that iCloud Drive is enabled, and that Yi Jing is enabled at the bottom of the list.
When iCloud is turned off, a separate journal is used on your device. If iCloud is turned on again, that separate journal will be merged with the journal used for syncing through iCloud.
You may encounter one or more issues with iCloud syncing. If this is the case for you, see the sections below for details.