Right now, we don't have binary data support (which includes file handling) in Javascript. It's a bit different than Objective-C and Java because Javascript doe

Right now, we don't have binary data support (which includes file handling) in Javascript. It's a bit different than Objective-C and Java because Javascript doesn't have great native support for a binary data type. So we can't just expose the same API for binary data that we use for native SDKs. We're working on figuring out a really clean way to support binary data, though.