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O365 - CSOM upload large files
var spContext = SharePointContextProvider.Current.GetSharePointContext(HttpContext, SPHostUrl);
using (var clientContext = spContext.CreateUserClientContextForSPAppWeb())
if (clientContext != null)
//file is uploaded file. Could be read from Request.Files
using (FileStream fs = new FileStream(file.FileName, FileMode.Open))
//code for file size > 2MB. tested upto 50MB
FileCreationInformation newFile = new FileCreationInformation();
newFile.ContentStream = fs;
newFile.Url = Path.GetFileName(file.FileName);
newFile.Overwrite = true;
List docs = clientContext.Web.Lists.GetByTitle("List_Name");
Microsoft.SharePoint.Client.File uploadFile = docs.RootFolder.Files.Add(newFile);
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