diff --git a/lib/FileAPI.Form.js b/lib/FileAPI.Form.js
index 050ce3b7..923e9e74 100644
--- a/lib/FileAPI.Form.js
+++ b/lib/FileAPI.Form.js
@@ -27,6 +27,10 @@
 		},
 
 		toData: function (fn, options){
+		    // allow chunked transfer if we have only one file to send
+		    // flag is used below and in XHR._send
+		    options._chunked = api.support.chunked && options.chunkSize > 0 && api.filter(this.items, function (item){ return item.file; }).length == 1;
+
 			if( !api.support.html5 ){
 				api.log('FileAPI.Form.toHtmlData');
 				this.toHtmlData(fn);
@@ -35,8 +39,8 @@
 				api.log('FileAPI.Form.toMultipartData');
 				this.toMultipartData(fn);
 			}
-			else if( api.support.chunked && options.chunkSize > 0 ){
-				api.log('FileAPI.Form.toMultipartData');
+			else if( options._chunked ){
+				api.log('FileAPI.Form.toPlainData');
 				this.toPlainData(fn);
 			}
 			else {
@@ -83,9 +87,29 @@
 				if( file.file ){
 					data.type = file.file;
 				}
-				data.name = file.blob.name;
-				data.file =  file.blob;
-				data.size =  file.blob.size;
+				if( file.blob.toBlob ){
+				    // canvas
+					queue.inc();
+					file.blob.toBlob(function (blob){
+						data.name = file.name;
+						data.file =  blob;
+						data.size =  blob.length;
+						queue.next();
+					}, 'image/png');
+				}
+				else if( file.file ){
+				    //file
+					data.name = file.blob.name;
+					data.file =  file.blob;
+					data.size =  file.blob.size;
+				}
+				else {
+				    // additional data
+				    if (!data.params) {
+				        data.params = [];
+				    }
+				    data.params.push(encodeURIComponent(file.name) + "=" + encodeURIComponent(file.blob));
+				}
 				data.start = 0;
 				data.end = 0;
 				data.retry = 0;
diff --git a/lib/FileAPI.XHR.js b/lib/FileAPI.XHR.js
index 1dd17224..abc51458 100644
--- a/lib/FileAPI.XHR.js
+++ b/lib/FileAPI.XHR.js
@@ -129,6 +129,10 @@
 				// html5
 				xhr = _this.xhr = api.getXHR();
 
+				if (data.params) {
+				    url += (url.indexOf('?') < 0 ? "?" : "&") + data.params.join("&");
+				}
+
 				xhr.open('POST', url, true);
 				xhr.withCredential = "true";
 
@@ -141,8 +145,8 @@
 				});
 
 				
-				if (api.support.chunked && options.chunkSize > 0) {
-					// resumable upload
+				if ( options._chunked ) {
+					// chunked upload
 					if( xhr.upload ){
 						// https://github.com/blueimp/jQuery-File-Upload/wiki/Fixing-Safari-hanging-on-very-high-speed-connections-%281Gbps%29
 						xhr.upload.addEventListener('progress', api.throttle(function (/**Event*/evt){
@@ -199,7 +203,7 @@
 					(slice = 'slice') in data.file || (slice = 'mozSlice') in data.file || (slice = 'webkitSlice') in data.file;
 
 					xhr.setRequestHeader("Content-Range", "bytes " + data.start + "-" + data.end + "/" + data.size);
-					xhr.setRequestHeader("Content-Disposition", 'attachment; filename=' + data.name);
+					xhr.setRequestHeader("Content-Disposition", 'attachment; filename=' + encodeURIComponent(data.name));
                     
 					slice = data.file[slice](data.start, data.end + 1);