diff --git a/static/sdk.js b/static/sdk.js
index 69e0f63..abd1740 100644
--- a/static/sdk.js
+++ b/static/sdk.js
@@ -152,13 +152,20 @@ var contented = (function ($, currentScriptPath) {
                         cache: false,
                         contentType: false,
                         processData: false,
-                        beforeSend: function (xhr) {
-                            xhr.on('progress', function (ev) {
-                                if (ev.lengthComputable) {
-                                    setProgressCaption("Uploaded " + formatBytes(evt.loaded) + " of " + formatBytes(evt.total) + "...");
-                                    setProgressPercentage(evt.loaded / evt.total);
-                                }
-                            });
+                        xhr: function() {
+                            var xhr = $.ajaxSettings.xhr();
+                            xhr.upload.addEventListener(
+                                'progress',
+                                function(ev) {
+                                    console.log([ev.lengthComputable, ev.loaded, ev.total]);
+                                    if (ev.lengthComputable) {
+                                        setProgressCaption("Uploading (" + formatBytes(ev.loaded) + " / " + formatBytes(ev.total) + ")...");
+                                        setProgressPercentage(ev.total == 0 ? 0 : ev.loaded / ev.total);
+                                    }
+                                },
+                                false
+                            );
+                            return xhr;
                         },
                         complete: function () {
                             setProgressCaption("Upload complete.");