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About OAUTH2 for authentication: [https://docs.microsoft.com/en-us/graph/auth-v2-user]\\
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!!!Microsoft Graph Application registration
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It requires Microsoft Graph Application registration. Start at the Microsoft azure portal:\\
[https://azure.microsoft.com/en-us/features/azure-portal/]\\
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__Application registration: __Go to the App registrations and click on New registration:\\
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[attachments|new_registration.png]\\
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Name it. Select the Multitenant and personal Microsoft accounts type. The redirect url must ends with :register_microsoft_graph_api/. Then click on register.\\
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[attachments|register_app.png]
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__API permission :__ You also need to provide permission for the Microsoft Graph. Go to the Api permission. Click on Add permission, select Microsoft Graph. Choose Delegated permission and add the "Files.ReadWrite.All" permission:\\
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