I'm struggling to find how Sharepoint works.
My goal is to upload a file to the 'Document Center' of my company from php using the Graph.
I think DocumentLibraries are seen as drives but I can't find the name or ID of the Document folder.
GET https://graph.microsoft.com/beta/sites/mycompany.sharepoint.com/drive/{ID TO FIND}/children
How can I find this ID ? (and if you know how i can find childrens IDs, it could be interesting)