diff --git a/lib/directive.js b/lib/directive.js
index 25986d5..bf059b3 100644
--- a/lib/directive.js
+++ b/lib/directive.js
@@ -36,7 +36,7 @@
 /**
  * @typedef {Object} FileInfo
  *
- * @property {String} name
+ * @property {String} [name] - Given name to the file.
  * @property {Number} size - File-size in bytes.
  * @property {String} [type] - mime type.
  *
@@ -145,7 +145,8 @@ _.extend(Slingshot.Directive.prototype, {
 
   getInstructions: function (method, file, meta) {
     var instructions = this.storageService().upload(method, _.extend({
-      contentDisposition: "inline; filename=" + quoteString(file.name, '"')
+      contentDisposition: file.name &&  "inline; filename=" +
+        quoteString(file.name, '"')
     }, this._directive), file, meta);
 
     check(instructions, {
@@ -202,7 +203,7 @@ Meteor.methods({
         check(type, String);
         return !type || /^[^\/]+\/[^\/]+$/.test(type);
       })),
-      name: String,
+      name: Match.Optional(String),
       size: Match.Where(function (size) {
         check(size, Number);
         return size >= 0;
diff --git a/lib/upload.js b/lib/upload.js
index b5b27df..3bd59a7 100644
--- a/lib/upload.js
+++ b/lib/upload.js
@@ -80,19 +80,14 @@ Slingshot.Upload = function (directive, metaData) {
     },
 
     /**
-     * @param {File} file
+     * @param {(File|Blob)} file
      * @param {Function} [callback]
      * @returns {Slingshot.Upload}
      */
 
     send: function (file, callback) {
-      if (window.chrome && window.navigator.vendor === "Google Inc.") {
-        check(file, window.File);
-      } else {
-        // not Google chrome
-        if (! (file instanceof window.File))
-          throw new Error("Not a file");
-      }
+      if (! (file instanceof window.File) && ! (file instanceof window.Blob))
+        throw new Error("Not a file");
 
       self.file = file;