Fires inside specific upload-type views in the legacy (pre-3.5.0)
media popup based on the current tab.

The dynamic portion of the hook name, $type, refers to the specific
media upload type.

The hook only fires if the current $tab is ‘type’ (From Computer),
‘type_url’ (From URL), or, if the tab does not exist (i.e., has not
been registered via the {@see ‘media_upload_tabs’} filter.

Possible hook names include:

• media_upload_audio
• media_upload_file
• media_upload_image
• media_upload_video

do_action( "media_upload_{$type}" );