The hook occurs in the following file:
101 102 103 104 105 106 107 108 109 110 111 112 | /**
* Fires inside limited and specific upload-tab views in the legacy
* (pre-3.5.0) media popup.
*
* The dynamic portion of the hook name, `$tab`, refers to the specific
* media upload tab. Possible values include 'library' (Media Library),
* or any custom tab registered via the {@see 'media_upload_tabs'} filter.
*
* @since 2.5.0
*/
do_action( "media_upload_{$tab}" );
}
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