I have been looking for a new platform for my digital portfolios for a long time now. I think I found it! :) For several years I have been using my class website on Weebly and uploading the pics in slideshows for each student. I didn't particularly like doing it that way, but didn't know of a better one. This year I started playing with Seesaw: http://web.seesaw.me/ .
It's very easy to make personalized portfolios that the parents can access. You simply create an account for each student. When they write something I take a picture and upload it. Right away I have the student record what they wrote. The parents are notified that something new was added and they can see it on the app on their phone.
I just started using this app with this new class, but so far I really like it and thought I would share.