do_action( 'pre-plupload-upload-ui' )

Fires before the upload interface loads.

Source

Used By	Description
wp-admin/includes/media.php: media_upload_form()	Outputs the legacy media upload form.
wp-includes/media-template.php: wp_print_media_templates()	Prints the templates used in the media manager.

Version	Description
3.3.0
2.6.0	Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/pre-plupload-upload-ui