Since May 17th you can upload additional documents online.
You have submitted an application or notice of objection and you want to add one or more additional documents. This can now be done online. You can upload the documents via the website (only in Dutch). The documents are then added to your application.
This is only possible if you have not yet received a decision on your application or notice of objection. You need the case number for the upload. You can find the case number on the confirmation of receipt.
You can upload multiple documents up to 40 MB.