Epson WorkForce Pro WF-C8690 A3 Color MFP with PCL/PostScript - Manual (Page 32)

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You see a window like this:
3. Make sure Acquire from Printer is selected, and click Get .
The optional paper sources are listed in the Current Printer Information section.
4. Click OK .
The optional paper cassettes are now enabled.
Parent topic: Installing the Optional Paper Cassette Units
Related tasks
Synchronizing Printer Settings - Epson Universal Print Driver - Windows
Enabling the Optional Paper Cassettes - PostScript Printer Software - Windows
Enabling the Optional Paper Cassettes - PostScript Printer Software - Mac
Enabling the Optional Paper Cassettes - Mac
You need to enable the optional paper cassette units before you can use them with the printer software.