To propagate electronic filing, the Intellectual Property Office (TIPO) added new Paragraph 4 to Rule 26 of the Enforcement Rules of the Patent Act. If an applicant submits a priority document by the electronic means stipulated by the TIPO, the original or certified copy of the document would be required no longer. The previous general provision for mandatory submission of the original or certified copy of a document as proof was repealed in 2016.
 

Reference:修正「專利電子申請及電子送達實施辦法」第11條, Taiwan Intellectual Property Office (June 30, 2016). Retrieved December 27, 2016,
from http://www.tipo.gov.tw/ct.asp?xItem=594662&ctNode=7452&mp=1
[1] Chief in Patent Division