How to get deleted photos
How do I restore my picture and text if deleted by accident
iPhone 12 Pro Max, iOS 14
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If you were syncing Messages with iCloud and deleted them, they can't be recovered. If you weren't syncing Messages with iCloud, do you have a backup you can restore from? Restoring from a backup erases all data currently on your device. Any data newer than when the backup was made will be erased. A restore is an all or nothing restore. You can't access a backup and only restore certain files.
Backup - Restore your device from an iCloud or iTunes backup.
Have you checked the Photos app and at iCloud.com/Photos using a computer browser for a Recently Deleted album? If you weren't syncing photos with iCloud, do you have a backup you can restore from?