tubaguy50035

Put meta fields in attachment settings meta box.
Copy custom_attachment_fields.php_copy to custom_attachment_fields.php, alter the array to add the fields you want, profit.

Attachment Meta

Put meta fields in attachment settings meta box.

Ruslan Mikhno

This is a very simple plugin that allows you to bulk change author for media files.
The action is added in the “List” view of the Media Library.

Bulk Change Media Author

Bulk change author for multiple media files, using the default WP Media Library.

Attachment Meta vs Bulk Change Media Author