I'm trying to add a tab to the files popup in the CMS under "Files and Images", I also need this to have access to the data in the other tab so I know which file I'm viewing. I've tried a few things but not had any luck.

Does anyone have a solution to this problem?

Thanks.

I would also like to add a new tab and fields to the Files Popup in the CMS under Files and Images. How can it be done?

Found the solution after trying a lot of things:

public function updateCMSFields(FieldSet &$fields) {
	$newTab = new Tab('NewTab', 'New Tab');
	$fields->insertAfter($newTab, 'Main');
	$newTab->fields()->push(new TextField('NewField'));
}