Image will not stay as icons in block library

I'm making a simulink library and to personalize it, I am adding an icon to the block. The only issue is, when I close the library, I get a '???' in the middle, and I am able to apply the image again after I imread the image in the command line. What am I missing?

 image(imread('BW.jpg'),[.35, .3, .3, .4],'on')
 port_label('output', 1, 'signal out')
 port_label('input', 1, 'signal in')
 port_label('input', 2, 'tau')

Answer 1

[Drew Davis]

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