To attach files to posts, use the Attachments option at the bottom of the page.
You can also embed images, audio, and video in posts by using BBCode.
For handwriting assignments, you can scan your paper or take a photo with your phone. If you take a photo, please make sure it’s clear enough to read. If the file is too large to post (10 MB limit), please use an image resizer like resizeimage.net to shrink it a bit.
For audio assignments, I use Audacity to record my questions and review, but if you have another program or app that you like, please use whatever you are comfortable with.