2. No way to add a portfolio to a single article either K2 or Joomla standard.
3. No documentation, but the control panel seem straight forward enough to get by
BT_Portfolio, it really should have had a trial period first while they get more bugs fixed.
Right now the best I can give is 2 stars, lets hope they address these critical problems in a timely manner.
Thank you for using our component! What's version you are using? Please download the latest version, we have been fixed all errors that you said :
1. Please check it at : http://extensions.bowthemes.com/single-portfolio
2. Please download content plugin to insert portfolio to Joomla article content. I am sorry but this extension does not support insert to K2 Item (We think it's not really necessary).
3. We have been updated video tutorial for this extension. You can see it at product detail page!
Thank you again and hope you will love the latest version!