Many different kinds of documentation are acceptable for your ePortfolio.
The most effective documentation makes clear reference to Course Outcomes.
If you have little or no supporting documentation, that’s okay because the ePortfolio components all work in concert.
Letters of Recommendation are very effective documentation, and can be generated if you don’t have a lot of other documentation.
Ask for Letters of Recommendation as early as possible.
The best Prior Learning Portfolios link the Educational Narrative with the Supporting Documentation so that the two components are intertwined and strengthen each other.