diff --git a/public/javascripts/attachments.js b/public/javascripts/attachments.js
index 43803ba..a67ca4a 100644
--- a/public/javascripts/attachments.js
+++ b/public/javascripts/attachments.js
@@ -99,8 +99,10 @@ function uploadBlob(blob, uploadUrl, attachmentId, options) {
   return $.ajax(uploadUrl, {
     type: 'POST',
     contentType: 'application/octet-stream',
-    beforeSend: function(jqXhr) {
+    beforeSend: function(jqXhr, settings) {
       jqXhr.setRequestHeader('Accept', 'application/js');
+      // attach proper File object 
+      settings.data = blob;
     },
     xhr: function() {
       var xhr = $.ajaxSettings.xhr();
@@ -117,7 +119,7 @@ function uploadBlob(blob, uploadUrl, attachmentId, options) {
 function addInputFiles(inputEl) {
   var clearedFileInput = $(inputEl).clone().val('');
 
-  if ('FileReader' in window && inputEl.files) {
+  if (inputEl.files) {
     // upload files using ajax
     uploadAndAttachFiles(inputEl.files, inputEl);
     $(inputEl).remove();