If you want to add a cover letter to the application form you need to add a little of code
You can add this code to a (child) theme’s functions.php file or any other location that works for you.
function mdocs_example_matador_application_default_fields( $fields ) {
$field_to_add = [ 'letter', ];
return array_merge( $fields, $field_to_add );
}
add_filter( 'matador_application_fields_defaults', 'mdocs_example_matador_application_default_fields' );
If you wish to adjust the label and description then you can use this code
function mdocs_example_matador_application_fields_structure( $fields ) {
$fields['letter']['label'] = 'Upload Additional document';
$fields['letter']['description'] = 'Attach an additional file, if applicable. Accepted file types are DOC, DOCX, PDF, HTML, and TXT.';
return $fields;
} );
add_filter( 'matador_application_fields_structure', mdocs_example_matador_application_fields_structure' );
Matador can support more files but this would require additional code. Contact support for details