In fact, there is no need to uninstall your WhatsApp Messenger so as to restore your WhatsApp Attachment There is the other way to solve the problem. You can complete the task with the help of FoneDog Android Data Recovery.
FoneDog Android Data Recovery excels in recovering all kinds of files from Android phone, including the big brand Samsung. The latest version of this program now also supports retrieving deleted WhatsApp Attachment, including chat history and WhatsApp pictures. Even if you have no backups, you have access to restore the WhatsApp Messenger without making any effort with this program.
Step 1. Connect Samsung Phone to PC/Mac
To begin with, open FoneDog Android Data Recovery on your computer. Then connect your Samsung phone (Samsung Galaxy S7/S8 for example) to the computer. Then enable USB debugging on the phone so that it can be recognized.
Step 2. Select File Types to Scan
When in the interface as below, you can choose data types to scan and recover. To recover WhatsApp data from your Samsung device, please select "WhatsApp" and "WhatsApp Attachment". Then click the "Next" button and move on.
Step 3. Allow Superuser Request
Go to your Samsung phone. You should have a Superuser request. Tap "Allow"/ "Authorize"/ "Grant". Then the program can access your Samsung handset and scan for WhatsApp messages, pictures and other attachments
Step 4. Scan and Recover WhatsApp Attachment from Samsung
Wait for a few minutes. When scanning is completed, you can preview your WhatsApp conversations before restoring them from your device. Check "WhatsApp" and "WhatsApp Attachment" at the left pane. Then you can read WhatsApp Attachment, look through the pictures sent and received via WhatsApp Attachment, and many more. Note that name of deleted items are in red font.
After previewing, check items you would like to retrieve and check the "Recover" button to get stuffs back.
Now you have got back WhatsApp Attachment. Besides, those who are going to restore WhatsApp images from Android can also refer to our post.
Completed guide: How to Recover Deleted WhatsApp Attachment from Samsung