addAnimatedFlag example

        $fileExtension = mb_strtolower($mediaFile->getFileExtension());
        if (!\array_key_exists($fileExtension, self::SUPPORTED_FILE_EXTENSIONS)) {
            return $previouslyDetectedType;
        }

        if ($previouslyDetectedType === null) {
            $previouslyDetectedType = new ImageType();
        }

        $previouslyDetectedType->addFlags(self::SUPPORTED_FILE_EXTENSIONS[$fileExtension]);
        $this->addAnimatedFlag($mediaFile, $previouslyDetectedType);

        return $previouslyDetectedType;
    }

    private function addAnimatedFlag(MediaFile $mediaFile, MediaType $rootType): void
    {
        $fileExtension = mb_strtolower($mediaFile->getFileExtension());
        if ($fileExtension === 'gif' && $this->isGifAnimated($mediaFile->getFileName())) {
            $rootType->addFlag(ImageType::ANIMATED);
        }