Match preferred media type even if file extension is capitalized, e.g., example.MP3 should be audio/mpeg. Fixes DDR-1438.
Match preferred media type even if file extension is capitalized, e.g., example.MP3 should be audio/mpeg. Fixes DDR-1438.

duke-libraries/ddr-models,duke-libraries/ddr-models,duke-libraries/ddr-models