Hello Arno, The error that you’re receiving is not coming from Indicium, I think it is probably coming from IIS. It looks like your request is invalid in some way, but it’s not immediately clear why. Does it work if you try a POST request without a file in it? If no, does it work if you try to hard code the base URL? It’s hard for me to tell what the value of “_optionsMonitor.CurrentValue.GetUriToBranch()” might be. I installed the Flurl.Http package myself to try it out and I had no issues uploading a file. I used the following C# code: IFlurlRequest request = new FlurlRequest(new Flurl.Url("https://localhost/indicium/iam/itst")) .AppendPathSegment("filestorage_file_system") .WithBasicAuth("username", "password");try{ IFlurlResponse response = await request.PostJsonAsync(new { file_system_file = new { FileName = "test.jpg", File = "BASE64 STRING HERE" } }); Console.WriteLine($"Success: {response.ResponseMessage.IsSuccessStatusCode}");}catch (FlurlHttpExceptio
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