https://www.epo.org/en/service-support/faq/myepo-services/online-filing-software/pct-procedure-and-online-submissions/can
Can subsequently filed documents for the PCT procedure and the demand procedure (Chapter II) be filed online?
Yes, they can.
Read the Notice from the European Patent Office dated 23 September 2016 concerning the online filing of subsequently filed documents under the PCT, including the demand under PCT Chapter II.
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