wp_generate_attachment_metadata

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Example


To generate attachment metadata for attachment with parent post ID 37:

<?php
  $attach_id = wp_insert_attachment( $attachment, $filename, 37 );
  $attach_data = wp_generate_attachment_metadata( $attach_id, $filename );
  wp_update_attachment_metadata( $attach_id,  $attach_data );
?>

The function should be used in conjunction with wp_update_attachment_metadata().

See more https://codex.wordpress.org/Function_Reference/wp_generate_attachment_metadata