We can upload multiple medias to server?

I'm trying to upload an array of images but it don't upload any images of my array... someone knows how to upload multiple medias?

var imgs = []
 
imgs.push( Ti.Filesystem.tempDirectory, "img1.png" );
imgs.push( Ti.Filesystem.tempDirectory, "img2.png" );
imgs.push( Ti.Filesystem.tempDirectory, "img3.png" );
imgs.push( Ti.Filesystem.tempDirectory, "img4.png" );
 
xhr = Ti.Network.createHTTPClient();
 
xhr.onload = function(e){
    Ti.API.info( 'Success' );
};
 
xhr.error = function(e){
    Ti.API.info( "Error" );
};
 
xhr.onsendstream = function(e){
    Ti.API.info( "ONSENDSTREAM - PROGRESS: " + e.progress )
};
 
xhr.setRequestHeader( "Content-Type", "multipart/form-data" );
xhr.open( 'POST', 'myServerURL' );
 
xhr.send({
    "media" : imgs      // This don't work!
    //"media" : imgs[0]  -- THIS WORK
});