Flexform::getFalMedia() 

\nn\t3::Flexform()->getFalMedia($ttContentUid = NULL, $field = ''); 

Deletes FAL media that were specified directly in the FlexForm

\nn\t3::Flexform()->getFalMedia( 'falmedia' );
\nn\t3::Flexform()->getFalMedia( 'settings.falmedia' );
\nn\t3::Flexform()->getFalMedia( 1201, 'falmedia' );
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$cObjData = \nn\t3::Tsfe()->cObjData();
$falMedia = \nn\t3::Flexform()->getFalMedia( $cObjData['uid'], 'falmedia' );
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| @return array

Source Code 

public function getFalMedia( $ttContentUid = null, $field = '' )
{
	if (!$field && $ttContentUid) {
		$field = $ttContentUid;
		$ttContentUid = \nn\t3::Tsfe()->cObjData()['uid'];
	}
	$fileRepository = GeneralUtility::makeInstance(\TYPO3\CMS\Core\Resource\FileRepository::class);
	$fileObjects = $fileRepository->findByRelation('tt_content', $field, $ttContentUid);
	foreach ($fileObjects as $n=>$fal) {
		$fileObjects[$n] = \nn\t3::Convert( $fal )->toFileReference();
	}
	return $fileObjects;
}
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