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Step 4: The 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 to the field configuration.
Case Case 1: Files extensions are different from the configuration.
Case 2: The sum of all sizes is greater than the defined one.
Case 3 : One or more attached file(s) is empty ( file size equals 0 KB) differently from the configuration.
