Brother MFC 9970CDW - Manual (Page 196)

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 Settings tab
Choose the E-mail Application, File Type, Resolution, Scan Type, Document Size,
Duplex (two-sided) Scanning (For MFC-9560CDW and MFC-9970CDW, if necessary),
Show Scanner Interface, Brightness and Contrast settings.
Scan to File
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 General tab
Enter a name in Name for Custom (up to 30 characters) to create the button name.
Choose the type of scan from the Scan Action field.