Uploading a Document to Salesforce CMS With Connect API

May 21, 2025

Salesforce CMS Documents can be posted through the Connect API CMS Contents endpoint:

• https://developer.salesforce.com/docs/atlas.en-us.chatterapi.meta/chatterapi/connect_resources_cms_contents.htm

The following example code shows how to upload a string variable containing json. In the example, the SalesforceCmsMediaRequest class is based on the request properties outlined on the endpoint page above. The SalesforceCmsMediaResponse class is based on the following documentation:

• https://developer.salesforce.com/docs/atlas.en-us.chatterapi.meta/chatterapi/connect_responses_managed_content_document.htm

Besides this, you also need to authorize requests using OAuth as described here:

• https://developer.salesforce.com/docs/atlas.en-us.chatterapi.meta/chatterapi/intro_using_oauth.htm

C# Upload Example Using .Net 8

public async Task<SalesforceResponse> PostCmsMediaFile(string json, string fileName, SalesforceCmsMediaRequest cmsMedia)
{
      SalesforceResponse model = new SalesforceResponse();

      using (var httpContent = new MultipartFormDataContent("FILE"))
      {
            byte[] fileBytes = Encoding.UTF8.GetBytes(json);

            using (var fileStream = new MemoryStream(fileBytes))
            {
                  fileStream.Position = 0;

                  var jsonContent = new StringContent(JsonConvert.SerializeObject(cmsMedia), Encoding.UTF8, "application/json");
                  httpContent.Add(jsonContent, "\"ManagedContentInputParam\"");

                  var fileContent = new StreamContent(fileStream);
                  fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data")
                  {
                        Name = "\"contentData\"",
                        FileName = "\"" + fileName + "\""
                  };
                  fileContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
                  fileContent.Headers.ContentType.CharSet = Encoding.UTF8.WebName;
                  httpContent.Add(fileContent);

                  var content = httpContent.ReadAsStringAsync().Result;

                  var response = await _client.PostAsync(SalesforceConstants.ConnectApi.ContentsPath, httpContent);
                  model = new SalesforceResponse(response);
            }
      }

      return model;
}