The Data Upload service is accessed in a different way than access for other services using the Web User Interface.
You can upload files for translation by navigating to the Configure page of the appropriate workspace service. You can upload data files for Data Download, Data Streaming, and Job Submitter services.
When a published parameter of a workspace represents a file, the File Upload section becomes available, which allows you to browse to the file you want to upload. This action invokes the Data Upload service to upload the file to FME Server.
For step-by-step instructions, see Uploading Data Files.