I have an app that needs to collect a bunch of data while connected to a stream. I need to save this data to a file that I can later pull off my device and analyze using a stan
Files are not visible unless you make them explicitly available. See my blog post about the MediaScanner to read more about this.
It's the developer's job to take care of this and to make sure that all files, the user might want to access, are made available to the MediaScanner.