PlatformFile.source() not available in WasmJS?

Hello,

As I am working with large video files on a CMP app with Android / iOS / Desktop JVM / WasmJS targets, I wonder why isn't `PlatformFile.source()` available on WasmJS? 

If it's not possible to buffer files on web, how am I supposed to stream a file into a multipart request so that I do not load the whole file in memory by having to use `readBytes` ?

Thank you in advance 🙏 