I successfully uploaded the file using this code:

public function execute()
    /** @var \Magento\Framework\Controller\Result\Redirect $resultRedirect */
    $resultRedirect = $this->resultRedirectFactory->create();
        $target = $this->_mediaDirectory->getAbsolutePath('mycustomfolder/');        
        /** @var $uploader \Magento\MediaStorage\Model\File\Uploader */
        $uploader = $this->_fileUploaderFactory->create(['fileId' => 'file']);
        /** Allowed extension types */
        $uploader->setAllowedExtensions(['jpg', 'jpeg', 'gif', 'png', 'zip', 'doc']);
        /** rename file name if already exists */
        /** upload file in folder "mycustomfolder" */
        $result = $uploader->save($target);
        if ($result['file']) {
            $this->messageManager->addSuccess(__('File has been successfully uploaded')); 
    } catch (\Exception $e) {
    return $this->resultRedirectFactory->create()->setPath(
        '*/*/upload', ['_secure'=>$this->getRequest()->isSecure()]

the problem is I need to rename the file name if I found a specific string in that file name, is there a way to do this?


The method $uploader->save($target); has a second parameter: string $newFileName

Also you'll find the method $uploader->getUploadedFileName() to get the filename.

You can use strpos() to find the string in the file name.

I hope it helps you.

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