Adobe Portfolio (https://portfolio.adobe.com/) is only available through Creative Cloud app (Portfolio is not a part of Document cloud).

Actually, only Acrobat Pro DC has Portfolio web service included, because Acrobat Pro DC is part of the Creative Cloud (unlike Acrobat Standard DC).

My idea : I would like to consider Acrobat Standard DC to be available through creative cloud (like acrobat Pro DC) in order to have Portfolio included.