Epson PERFECTION 1240U Reference Manual page 35

Note:
When you install the optional Film Adapter, the following window
appears first.
If you want to scan from the document table on the scanner using
the Full Auto Mode, remove the Film Adapter, replace and close the
document cover and then click Scan. If you want to scan from the
Film Adapter, click the Manual Mode button.
2-5
Scanning Basics