The user can enjoy use the configured Attach file custom field to store files.
Step 1: Click on Attach files Icon 
and select files.
Step 2: Choose one, or multiple Files files from the Opening the opening dialog or Drag drag and Drop drop your Files.
Step 3: Many features become available :
1. Delete files from the custom field.
2. Preview images type or download the other file type
Step 4: The Attache Attach File Manager controls automatically the attachments according to the administrator's configuration, and displays error messages in case of files that do not correspond with to the field configuration.
Case 1: The files Files extensions are differents different from the configuration.
...
Case 2: The sum of all sizes is greater than the defined one
