Upload pre-selected file with actionscript - actionscript-3

Question

I'm creating a photoshop extension where I need to save the file people are working on and upload it to a server. So I want the extension to be able to automatically choose the current file and upload it to my server.
Problem is I don't know how to pre-select a file for people. Here's my code so far:
var app:Application = Photoshop.app;
var doc:Document = app.documents.add();
doc.selection.selectAll();
var color:RGBColor = new RGBColor();
color.red = 0;
color.green = 0;
color.blue = 255;
doc.selection.fill(color);
var saveOptions:JPEGSaveOptions = new JPEGSaveOptions();
//Add other PDF save options here.
doc.saveAs(File.applicationStorageDirectory, saveOptions);
var jsonOBJ:Object = {};
jsonOBJ.option = "iphone";
jsonOBJ.title = "c";
jsonOBJ.description = "s";
jsonOBJ.app_store_url = "iphone";
jsonOBJ.tags = "c";
jsonOBJ.temp_number = 1;
var _service:HTTPService = new HTTPService();
_service.url = "http://localhost:3000/designs";
_service.method = "POST";
_service.contentType = "application/json";
_service.resultFormat = "text";
_service.useProxy = false;
_service.makeObjectsBindable = true;
_service.addEventListener(FaultEvent.FAULT,faultRX);
_service.addEventListener(ResultEvent.RESULT,resultRX);
_service.showBusyCursor = true;
_service.send( JSON.encode( jsonOBJ ) );
function resultRX():void
{
trace(ResultEvent.RESULT);
}
function faultRX():void
{
trace(FaultEvent.FAULT);
}
var file:FileReference;
var filefilters:Array;
var req:URLRequest;
filefilters = [ new FileFilter('Images', '*.jpg') ]; // add other file filters
file.browse(filefilters);

Answer 1

It's a photoshop extension. I ended up using FileReference and link to the file. it worked. I dunno how to actually upload the image though. When I use file.upload(requestUrl), it sends along a wrong content type. –