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https://stackoverflow.com/questions/62515341/get-a…
Get all Files in a folder using Microsoft Graph API
You can't just list all of the children in the root, because it includes everything (function, files, folders, annotations, enums, etc.) and if there are more than 200 items you won't get a list, you'll get a next link to use to parse through them all. Besides, you want one answer, right? Based on your requirement, the best query is using a root path.