Yes, you can change your submission right until the deadline for hand-in. After the deadline for handing in is reached, you are no longer able to change your hand-in.

To change your submission click on the assignment. Then click the Assignment button in the top left of the assignment details pop up, circled in red below:  

You can now delete the submission by clicking Delete Submission and upload a new one. 

Submissions for Live Sessions cannot be changed.

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