Dan Menssen

Ran into the same problem today. I'm relatively sure the problem is here: https://github.com/facebook/react-native/blob/master/Libraries/Blob/RCTFileReaderModule.mm#L71 There is a null check for "type" on the subsequent line (defaulting it to application/octet-stream), but...

Same "Invalid Credentials" error from the attempt-fix... branch, if you want one more data point.