If you are unable to submit the documents by post, please contact firstname.lastname@example.org (subject: ZUL-O + application number). They will inform you how you can still apply. Please make sure that you upload all documents relevant to the application, including a certificate of recognition, proof of Master's entrance qualification (certificate and overview of subjects and grades) and proof of language skills.
The Student Service provides applicants with further helpful information on their website. Further information on the recognition of foreign certificates and diplomas in the current phase can be found here.
If you have any further questions on the application process, please contact the Student Services-International Admissions or your student advisor.