Bb Grader supports portfolio submissions. You can page through the portfolio using the arrows at the top of the submission.
Grade a Portfolio Submission
To apply a grade to a submission, tap the Grade icon in the upper right-hand corner of the interface. This opens the grading panel.
To enter a grade for the submission, tap the empty box in upper right-hand corner of the grading panel and type a score for this submission. To exempt a submission, tap Exempt on the left-hand side of the keyboard.
Rubrics, delegated grading, and anonymous grading are all available as options on portfolio assignments, and Bb Grader supports these as well when applied to portfolio assignments.