How to retrieve deleted photos
How do you retrieve deleted photos
iPad Pro, iOS 12
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Look in the recently deleted album in the photos app. Deleted photos remain there for 30 days.
If you emptied the recently deleted album and if you backup photos, you have to restore the backup to recover the photos. The photos that you deleted would have to be in the backup for this to work and when you restore a backup, you overwrite the current contents on your device.
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
You may have hidden photos as well.
Get help with missing photos - Apple Support