How to store downloads on an SD card
You can store downloaded TV shows and movies to an installed SD card on your Android or Amazon Fire device.
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Open the Netflix app and tap More
or your profile icon 
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Select App Settings.
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Under Downloads, select Download Location.
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Select where you would like to store your downloads.
Note:
This will change the storage location of future downloads. TV shows and movies you have already downloaded will remain where they are.