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Continue to ChatFrom C# to SharePoint - File Upload using CSOM with SubFolders structure https://samtech365.com/from-c-to-sharepoint-file-upload-using-csom-with-subfolders-structure/
From C# to SharePoint - File Upload using CSOM with SubFolders structure https://samtech365.com/from-c-to-sharepoint-file-upload-using-csom-with-subfolders-structure/