It seems that the scanner can work with pictures that are similar to an A4 paper. Larger pictures will not be able to be scanned. While you place your photo, you need to know that a portion of 0.04 inch (1 mm) from all sides will not be scanned. If you plan on scanning multiple pictures at the same time, make sure that you have between them at least 0.4 inch (1 cm). This might be the reason why the scanner "is cutting" from the pictures.
To scan a picture, it's advised to use the IJ Scan Utility. After you started the program, select Photo > Settings > set the resolution, size, etc > OK.