When you are creating an assignment you can choose to have students submit different files and/or links. 

File types include: PDF (.pdf), Zip (.zip), Word (.doc/.docx), Excel (.xlsx), Sketch App (.sketch), iPython Notebook (.ipynb). 

Links: Any type of can be uploaded including GoogleDocs and Youtube. 

Google Drive: Students can connect to their Google Drive and upload files directly from there.

Text: Students can type their assignment directly into the Peergrade text editor.

Video Recording: Students can record videos directly in Peergrade to submit.

Note: By default students can only submit one link or fill. To turn on multiple attachments go to Assignment Settings > Submissions.

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