Problem with schemaadapter and blob filed

We have problems with blob-fields. We test a client/Server Project with firedac. At the server we save a query result with a schemaadapter. At the client we load the result from >>server FDSchemaAdapter.SaveToStream(Result, TFDStorageFormat.sfJSON); >>client LStringStream := TStringStream.Create(FDStoredProcGet.Params[1].asBlob); FDSchemaAdapter.LoadFromStream(LStringStream, TFDStorageFormat.sfJSON); It works fine. But if the result is greater than 256kb, we get an error. Invalid json Format. How can we use a result greater than 256kb? Thanks for help.