The user can use the Attache fiels custom field configured by the administrator to store files.
Step 1: Click on Attach file Icon 
to select file.
Step 2: Select File in the Open dialog appears.
Step 3: The user can use several features of attachement file
...
3. Preview images.
4. Save file.
Step 4: The Attache File Manager controle automatically the attachments according to the administrator's configuration and displays error messages in case of files that do not correspond with the field configuration.
Case 1: The file extension different of the extension parameter in the configuration
Case 2: File size greater than define size in configuration
