It should play whatever format is supported by the unit and listed in the owners manual.
I just looked at the owners manual online and it does not mention anything about USB thumb drives. Out of the 3 different sites I found that have copies for the manual they are all the same and there is no mention on using the usb port for any purpose.
Below are a couple of threads on this forum about the problems others had with the EEDV06.
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Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989, Seasonal since 2000.
Car Shredder Op/Tech, Scrap Metal Recycling - retired