Here WhatsApp is used as an example.
1.Through 'MY APPS' Tab Launch the ES File Explorer.
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2. Open by clicking on 'Internal Storage'.
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3. Click on the 'WhatsApp' folder.
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4) Click on the 'Media' folder.
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5) Click the folder from which you want to copy the files (Here we selected 'WhatApp Images' as an example)
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6)Long press on the files to be selected and then click on more at the bottom right corner as shown below. Choose option 'Copy to'
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7) Select the 'Windows' -> 'BstSharedFolder' to copy your files, and click on 'OK' to confirm
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8) 'BstSharedFolder' on Bluestacks 3 is mapped to windows, and can be accessed at the following location on your computer
LOCATION: C:\Programdata\BlueStacks\Engine\UserData\SharedFolder 
(This location depends on the installation path you selected at the time of BlueStacks 3 installation)
9) On your PC, open the above location to access the files.
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