Can't import collections into postman

Hi all - I'm trying to go through the "Learning Postman using Brightspace" course and am unable to import any of the github collections into postman. I'm downloading the .json files and keep getting an invalid file error every time. I am new to all of this so I need the sample files in order to get through this tutorial. I don't see anywhere in the course for support so I'm trying here first. Please help!

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