Hello there, Kakumei.
It sounds like you're having issues with content not being restored to your iPad device from your iCloud backup. The following Knowledge Base article offers up some great insight and pointers:
Get help finding missing information in iCloud after restoring an iOS device
Messages (including iMessage and carrier SMS or MMS pictures and videos) are included in your iCloud backup and will download to your iOS device during the restore process. To restore messages to an iPhone or iPod touch, the iCloud backup must be from an iPhone or iPod touch. To restore messages to an iPad, the iCloud backup must be from an iPad.
If you're using iCloud Drive or Documents in the Cloud, your iWork documents aren't included in your iCloud backup. If you want to manually back up your iWork files, you can save them to your Mac or PC.
If you restored your device and can't find your iWork documents, check these places:
- If you're using Documents in the Cloud, open the app on your iOS device and look for your documents.
- If you're using iCloud Drive, go to iCloud.com and open the iCloud Drive app.
When restoring Calendar and Contact data from an iCloud backup, your settings and old data are restored first. Then iCloud pushes your updated Calendar and Contact data to the device, overwriting the old data. This update happens automatically and usually occurs before you notice the old data.
- Mail data isn't included in your iCloud backup, but your backup does include the settings for your iCloud email account and any other email accounts that you've added to your device. After the restore process is complete, your device retrieves any email messages available from iCloud and your email service providers.
- If you set up your device to store Notes data in iCloud (Settings > iCloud > Notes), iCloud sends those notes to your device after the restore process is complete.
- Notes data stored by a third-party service (such as Microsoft Exchange) isn't backed up to iCloud. Consult the provider of that service for information about how to retrieve the data.
- When you restore your device, iCloud downloads your apps from the App Store and restores their data.
- Data for some third-party apps might need to be downloaded again from the app provider.
- Apps that Apple or the app provider removed from the App Store cannot be restored or downloaded.
- Apps that weren't backed up to iCloud, but are still available in the App Store, can be downloaded again.
When restoring from an iPhone or iPod touch backup to an iPad, or vice versa:
- The order in which app icons are displayed onscreen is not preserved.
- Only third-party apps and their data are restored, excluding apps that aren't compatible with the device. For example, an app that is compatible only with iPad won't be restored to iPhone.
If you have issues with particular apps this article can be helpful as well:
If an app you installed unexpectedly quits, stops responding, or won’t open
Thanks for reaching out to Apple Support Communities.
Kind Regards.
