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We sacrifice by not doing any other technology, so that you get the best of Magento.

    Follow the below steps, and the email attachment will start working as it worked previously.

    First, you have to create a “di.xml” file inside your extension folder.

    app/code/Magemonkeys/EmailAttachment/etc

    <preference for="MagentoFrameworkMailTemplateTransportBuilder" type="MagemonkeysEmailAttachmentModelMailTemplateTransportBuilder" />

    Now, you have to create one more file “transportBuilder.php” inside your Template folder with the below code.

    app/code/Magemonkeys/EmailAttachment/Model/Mail/Template/

    <?php
    declare(strict_types=1);
    namespace MagemonkeysEmailAttachmentModelMailTemplate;
    use MagentoFrameworkAppTemplateTypesInterface;
    use MagentoFrameworkExceptionLocalizedException;
    use MagentoFrameworkExceptionMailException;
    use MagentoFrameworkMailEmailMessageInterface;
    use MagentoFrameworkMailEmailMessageInterfaceFactory;
    use MagentoFrameworkMailAddressConverter;
    use MagentoFrameworkMailExceptionInvalidArgumentException;
    use MagentoFrameworkMailMessageInterface;
    use MagentoFrameworkMailMessageInterfaceFactory;
    use MagentoFrameworkMailMimeInterface;
    use MagentoFrameworkMailMimeMessageInterfaceFactory;
    use MagentoFrameworkMailMimePartInterfaceFactory;
    use MagentoFrameworkMailTemplateFactoryInterface;
    use MagentoFrameworkMailTemplateSenderResolverInterface;
    use MagentoFrameworkMailTemplateInterface;
    use MagentoFrameworkMailTransportInterface;
    use MagentoFrameworkMailTransportInterfaceFactory;
    use MagentoFrameworkObjectManagerInterface;
    use MagentoFrameworkPhrase;
    use ZendMimeMime;
    use ZendMimePartFactory;
     
    /**
     * TransportBuilder
     *
     * @api
     * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
     * @since 100.0.2
     */
    class TransportBuilder extends MagentoFrameworkMailTemplateTransportBuilder
    {
        /**
         * Template Identifier
         *
         * @var string
         */
        protected $templateIdentifier;
     
        /**
         * Template Model
         *
         * @var string
         */
        protected $templateModel;
     
        /**
         * Template Variables
         *
         * @var array
         */
        protected $templateVars;
     
        /**
         * Template Options
         *
         * @var array
         */
        protected $templateOptions;
     
        /**
         * Mail Transport
         *
         * @var TransportInterface
         */
        protected $transport;
     
        /**
         * Template Factory
         *
         * @var FactoryInterface
         */
        protected $templateFactory;
     
        /**
         * Object Manager
         *
         * @var ObjectManagerInterface
         */
        protected $objectManager;
     
        /**
         * Message
         *
         * @var EmailMessageInterface
         */
        protected $message;
     
        /**
         * Sender resolver
         *
         * @var SenderResolverInterface
         */
        protected $_senderResolver;
     
        /**
         * @var TransportInterfaceFactory
         */
        protected $mailTransportFactory;
     
        /**
         * Param that used for storing all message data until it will be used
         *
         * @var array
         */
        private $messageData = [];
     
        /**
         * @var EmailMessageInterfaceFactory
         */
        private $emailMessageInterfaceFactory;
     
        /**
         * @var MimeMessageInterfaceFactory
         */
        private $mimeMessageInterfaceFactory;
     
        /**
         * @var MimePartInterfaceFactory
         */
        private $mimePartInterfaceFactory;
     
        /**
         * @var AddressConverter|null
         */
        private $addressConverter;
     
        protected $attachments = [];
     
        protected $partFactory;
     
        /**
         * TransportBuilder constructor
         *
         * @param FactoryInterface $templateFactory
         * @param MessageInterface $message
         * @param SenderResolverInterface $senderResolver
         * @param ObjectManagerInterface $objectManager
         * @param TransportInterfaceFactory $mailTransportFactory
         * @param MessageInterfaceFactory|null $messageFactory
         * @param EmailMessageInterfaceFactory|null $emailMessageInterfaceFactory
         * @param MimeMessageInterfaceFactory|null $mimeMessageInterfaceFactory
         * @param MimePartInterfaceFactory|null $mimePartInterfaceFactory
         * @param addressConverter|null $addressConverter
         * @SuppressWarnings(PHPMD.UnusedFormalParameter)
         * @SuppressWarnings(PHPMD.ExcessiveParameterList)
         */
        public function __construct(
            FactoryInterface $templateFactory,
            MessageInterface $message,
            SenderResolverInterface $senderResolver,
            ObjectManagerInterface $objectManager,
            TransportInterfaceFactory $mailTransportFactory,
            MessageInterfaceFactory $messageFactory = null,
            EmailMessageInterfaceFactory $emailMessageInterfaceFactory = null,
            MimeMessageInterfaceFactory $mimeMessageInterfaceFactory = null,
            MimePartInterfaceFactory $mimePartInterfaceFactory = null,
            AddressConverter $addressConverter = null
        ) {
            $this->templateFactory = $templateFactory;
            $this->objectManager = $objectManager;
            $this->_senderResolver = $senderResolver;
            $this->mailTransportFactory = $mailTransportFactory;
            $this->emailMessageInterfaceFactory = $emailMessageInterfaceFactory ?: $this->objectManager
                ->get(EmailMessageInterfaceFactory::class);
            $this->mimeMessageInterfaceFactory = $mimeMessageInterfaceFactory ?: $this->objectManager
                ->get(MimeMessageInterfaceFactory::class);
            $this->mimePartInterfaceFactory = $mimePartInterfaceFactory ?: $this->objectManager
                ->get(MimePartInterfaceFactory::class);
            $this->addressConverter = $addressConverter ?: $this->objectManager
                ->get(AddressConverter::class);
            $this->partFactory = $objectManager->get(PartFactory::class);
            parent::__construct($templateFactory, $message, $senderResolver, $objectManager, $mailTransportFactory, $messageFactory, $emailMessageInterfaceFactory, $mimeMessageInterfaceFactory,
                $mimePartInterfaceFactory, $addressConverter);
        }
     
        /**
         * Add cc address
         *
         * @param array|string $address
         * @param string $name
         *
         * @return $this
         */
        public function addCc($address, $name = '')
        {
            $this->addAddressByType('cc', $address, $name);
     
            return $this;
        }
     
        /**
         * Add to address
         *
         * @param array|string $address
         * @param string $name
         *
         * @return $this
         * @throws InvalidArgumentException
         */
        public function addTo($address, $name = '')
        {
            $this->addAddressByType('to', $address, $name);
     
            return $this;
        }
     
        /**
         * Add bcc address
         *
         * @param array|string $address
         *
         * @return $this
         * @throws InvalidArgumentException
         */
        public function addBcc($address)
        {
            $this->addAddressByType('bcc', $address);
     
            return $this;
        }
     
        /**
         * Set Reply-To Header
         *
         * @param string $email
         * @param string|null $name
         *
         * @return $this
         * @throws InvalidArgumentException
         */
        public function setReplyTo($email, $name = null)
        {
            $this->addAddressByType('replyTo', $email, $name);
     
            return $this;
        }
     
        /**
         * Set mail from address
         *
         * @param string|array $from
         *
         * @return $this
         * @throws InvalidArgumentException
         * @see setFromByScope()
         *
         * @deprecated 102.0.1 This function sets the from address but does not provide
         * a way of setting the correct from addresses based on the scope.
         */
        public function setFrom($from)
        {
            return $this->setFromByScope($from);
        }
     
        /**
         * Set mail from address by scopeId
         *
         * @param string|array $from
         * @param string|int $scopeId
         *
         * @return $this
         * @throws InvalidArgumentException
         * @throws MailException
         * @since 102.0.1
         */
        public function setFromByScope($from, $scopeId = null)
        {
            $result = $this->_senderResolver->resolve($from, $scopeId);
            $this->addAddressByType('from', $result['email'], $result['name']);
     
            return $this;
        }
     
        /**
         * Set template identifier
         *
         * @param string $templateIdentifier
         *
         * @return $this
         */
        public function setTemplateIdentifier($templateIdentifier)
        {
            $this->templateIdentifier = $templateIdentifier;
     
            return $this;
        }
     
        /**
         * Set template model
         *
         * @param string $templateModel
         *
         * @return $this
         */
        public function setTemplateModel($templateModel)
        {
            $this->templateModel = $templateModel;
            return $this;
        }
     
        /**
         * Set template vars
         *
         * @param array $templateVars
         *
         * @return $this
         */
        public function setTemplateVars($templateVars)
        {
            $this->templateVars = $templateVars;
     
            return $this;
        }
     
        /**
         * Set template options
         *
         * @param array $templateOptions
         * @return $this
         */
        public function setTemplateOptions($templateOptions)
        {
            $this->templateOptions = $templateOptions;
     
            return $this;
        }
     
        /**
         * Get mail transport
         *
         * @return TransportInterface
         * @throws LocalizedException
         */
        public function getTransport()
        {
            try {
                $this->prepareMessage();
                $mailTransport = $this->mailTransportFactory->create(['message' => clone $this->message]);
            } finally {
                $this->reset();
            }
     
            return $mailTransport;
        }
     
        /**
         * Reset object state
         *
         * @return $this
         */
        protected function reset()
        {
            $this->messageData = [];
            $this->templateIdentifier = null;
            $this->templateVars = null;
            $this->templateOptions = null;
            return $this;
        }
     
        /**
         * Get template
         *
         * @return TemplateInterface
         */
        protected function getTemplate()
        {
            return $this->templateFactory->get($this->templateIdentifier, $this->templateModel)
                ->setVars($this->templateVars)
                ->setOptions($this->templateOptions);
        }
     
        /**
         * Prepare message.
         *
         * @return $this
         * @throws LocalizedException if template type is unknown
         */
        protected function prepareMessage()
        {
            $template = $this->getTemplate();
            $content = $template->processTemplate();
            switch ($template->getType()) {
                case TemplateTypesInterface::TYPE_TEXT:
                    $part['type'] = MimeInterface::TYPE_TEXT;
                    break;
     
                case TemplateTypesInterface::TYPE_HTML:
                    $part['type'] = MimeInterface::TYPE_HTML;
                    break;
     
                default:
                    throw new LocalizedException(
                        new Phrase('Unknown template type')
                    );
            }
            $mimePart = $this->mimePartInterfaceFactory->create(['content' => $content]);
            $parts = count($this->attachments) ? array_merge([$mimePart], $this->attachments) : [$mimePart];
            $this->messageData['body'] = $this->mimeMessageInterfaceFactory->create(
                ['parts' => $parts]
            );
     
            $this->messageData['subject'] = html_entity_decode(
                (string)$template->getSubject(),
                ENT_QUOTES
            );
            $this->message = $this->emailMessageInterfaceFactory->create($this->messageData);
     
            return $this;
        }
     
        /**
         * Handles possible incoming types of email (string or array)
         *
         * @param string $addressType
         * @param string|array $email
         * @param string|null $name
         *
         * @return void
         * @throws InvalidArgumentException
         */
        private function addAddressByType(string $addressType, $email, ?string $name = null): void
        {
            if (is_string($email)) {
                $this->messageData[$addressType][] = $this->addressConverter->convert($email, $name);
                return;
            }
            $convertedAddressArray = $this->addressConverter->convertMany($email);
            if (isset($this->messageData[$addressType])) {
                $this->messageData[$addressType] = array_merge(
                    $this->messageData[$addressType],
                    $convertedAddressArray
                );
            }
        }
     
        /**
         * @param string|null $content
         * @param string|null $fileName
         * @param string|null $fileType
         * @return TransportBuilder
         */
        public function addAttachment(?string $content, ?string $fileName, ?string $fileType)
        {
            $attachmentPart = $this->partFactory->create();
            $attachmentPart->setContent($content)
                ->setType($fileType)
                ->setFileName($fileName)
                ->setDisposition(Mime::DISPOSITION_ATTACHMENT)
                ->setEncoding(Mime::ENCODING_BASE64);
            $this->attachments[] = $attachmentPart;
     
            return $this;
        }
    }

    Lastly, we have to create a call to the file as shown below.

    $this->transportBuilder->addAttachment($content, $fileName, 'application/pdf');

    That’s it. Now your email attachment issue should get resolved.

     

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