I was wondering if you'd kindly help me in understanding the bold part:
Please bring along all the required documents for your appointment at the Embassy. Submitting a complete file is responsibility of the applicant. Supporting documents sent by email or fax to the Embassy, like documents of the referent and/or the company in the Netherlands, cannot be held at the Embassy, should be submitted with the visa application form.
What does " cannot be held at embassy" mean here? Does it mean they're not able to keep documents there?
It means they will not keep your documents for you, waiting for you to have all of the necessary papers. If you email or fax stuff to them, don't expect them to have it. They want you to get all of the necessary papers together and submit them all at one time.