Some Day One users who sync with iCloud have reported that their journal is missing::
- Go to iOS Settings > Account (Your name at the top of the Settings screen) > iCloud on your affected iOS devices.
- Be sure iCloud Drive is enabled in this list
- Find Day One in the list of apps, then toggle it on.
- Open the Day One Classic app and go to Settings > Sync, then enable iCloud.
- Confirm that your content has reappeared in your Timeline.