This is a common question that being asked multiple times. First, please check whether you backed up the phone on a computer or online service like Dropbox, Google Drive or OneDrive.
If not, then you have to use data recovery software to retrieve the deleted files from the phone. There are plenty of such solutions when you search in Google.
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Here is a step-by-step guide: https://www.tunesbro.com/recover-deleted-photos-on-android.html
This is a common question that being asked multiple times. First, please check whether you backed up the phone on a computer or online service like Dropbox, Google Drive or OneDrive.
If not, then you have to use data recovery software to retrieve the deleted files from the phone. There are plenty of such solutions when you search in Google.