According to Moodle Docs, Moodle portfolios enable data, such as forum posts or assignment submissions, to be exported to external systems.
Moodle portfolios have to be enabled by selecting the Enable portfolios parameter in Advanced features. Once this has been done, you have access to all the available portfolio plugins by going to Plugins | Portfolios | Manage portfolios.
Each portfolio has one of the following three states:
Once a portfolio ...