Configure value of below key in file - emxApparelAccelerator.properties to a valid format of type Image Holder which will act as input file to be shown up in -
Sections - Primary Image, Sketches, Graphics in Product Specification Package
Sections - Primary Image in Fabric Mill Sheet
emxApparel.CrystalReports.Artwork.ImageFormat=format_mxLargeImage
Value of this key should be the symbolic name of the format. The OOTB default is 'mxLarge Image' format.