Filters attachment post data before it is updated in or added to the database.
Parameters
$dataarray- An array of slashed, sanitized, and processed attachment post data.
$postarrarray- An array of slashed and sanitized attachment post data, but not processed.
$unsanitized_postarrarray- An array of slashed yet *unsanitized* and unprocessed attachment post data as originally passed to wp_insert_post() .
$updatebool- Whether this is an existing attachment post being updated.
Source
$data = apply_filters( 'wp_insert_attachment_data', $data, $postarr, $unsanitized_postarr, $update );
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