This is the THIRD time the Edge deleted all the contents from my USB flash. I used two different USB flash drives. The first and the third time, everything from the flash just disappeared (just leaving the Lost directory), the second time it deleted about 70% of the files randomly.

I want to warn you not to save anything important (and not backed up) on your USB flash you use with the Edge, because there is obviously some big nasty bug that feeds on your USB flash data .