diff --git a/src/applications/files/uploadsource/PhabricatorFileUploadSource.php b/src/applications/files/uploadsource/PhabricatorFileUploadSource.php
--- a/src/applications/files/uploadsource/PhabricatorFileUploadSource.php
+++ b/src/applications/files/uploadsource/PhabricatorFileUploadSource.php
@@ -137,10 +137,6 @@
 
     $parameters = $this->getNewFileParameters();
 
-    $parameters = array(
-      'isPartial' => true,
-    ) + $parameters;
-
     $data_length = $this->getDataLength();
     if ($data_length !== null) {
       $length = $data_length;