Espruino Web IDE: Timed out receiving file

Wouldn't it be nice to transfer any data to/from bangle.js without special app support, regardless of the data size?

Yes - there's actually an issue open for it here so hopefully it'll get sorted soon: https://github.com/espruino/EspruinoWebIDE/issues/234

is there a way to transfer data using a command-line solution?

Yes - it's as easy as opening a Bluetooth LE 'Nordic UART' connection

https://www.espruino.com/Interfacing#bluetooth-le

and then uploading something like:

`\x03\x10(function() {
      var f = require("Storage").open(${JSON.stringify(filename)},"r");
      Bluetooth.println(f.getLength());
      var l = f.readLine();
      while (l!==undefined) { Bluetooth.print(l); l = f.readLine(); }
      Bluetooth.print("\xFF");
    })()\n`

There are the Espruino CLI tools, but they don't support this kind of thing with Storage at the moment