After you have filed a European patent application, you may file other documents as referred to in Rule 50 EPC
with the EPO in Munich, The Hague or Berlin, either electronically (via the EPO Online Filing software, the EPO case management system (CMS) or the EPO Web-Form Filing service) or by hand or by postal services. However, the EPO Web-Form Filing service cannot be used to file authorisations and priority documents (see also points 5.5.003, 5.6.002 and 5.7.004).
For subsequently filed documents, it is recommended that you use the electronic filing tools. The EPO provides forms which serve either as a prepared acknowledgement of receipt (EPO Form 1037) or as a letter accompanying subsequently filed documents (EPO Form 1038).