Merge pull request api-platform#981 from jaapjan/patch-1

Prevent uploaded files from being overwritten

Author: soyuka

core/file-upload.md

@@ -26,6 +26,8 @@ vich_uploader:
         media_object:
             uri_prefix: /media
             upload_destination: '%kernel.project_dir%/public/media'
+            # Will rename uploaded files using a uniqueid as a prefix.
+            namer: Vich\UploaderBundle\Naming\OrignameNamer
 ```
 
 ## Configuring the Entity Receiving the Uploaded File