_wp_make_subsizes()
Allows fallback previews (PDF by default, in core) to save image meta after each size is generated to allow for resuming, and make sizes immediately available. Props azaozz, antpb, progremzion, mikeschroder. See #48111. Built from https://develop.svn.wordpress.org/trunk@46459 git-svn-id: http://core.svn.wordpress.org/trunk@46257 1a063a9b-81f0-0310-95a4-ce76da25c4cd
wp_ajax_upload_attachment()
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at
wp-admin/update-core.php