I am following below Article to upload file in store configuration: https://www.mageplaza.com/devdocs/how-file-upload-sytem-configuration-magento-2.html

I have defined custom backend model as mentioned in this artice to validate my file type:


namespace Vendor\Package\Model\Config\Backend;

class CustomFileType extends \Magento\Config\Model\Config\Backend\File
     * @return string[]
    public function getAllowedExtensions() {
        return ['csv'];

and in system.xml, it's like this:

<field id="import" translate="label" type="Magento\Config\Block\System\Config\Form\Field\File" sortOrder="1" showInDefault="1" showInWebsite="0" showInStore="0">
                    <label>Import CSV</label>

but it's not working. I can upload image files too!!

What's wrong with this code?

  • Code looks fine. Did you run di:compile and flushed the cache as well? – Sukumar Gorai Jun 20 at 11:47
  • yes. I flushed the cache. do i need to run di:compile in developer mode too? – Khushbu Jun 20 at 11:50
  • Yes run once because if not compiled then might be an issue. – Sukumar Gorai Jun 20 at 11:56
  • Thank you @SukumarGorai. But i got the solution. See my answer. – Khushbu Jun 20 at 11:57
  • Yes I have checked. Happy coding! – Sukumar Gorai Jun 20 at 11:58

I found answer by referring


Correct Function name is _getAllowedExtensions not getAllowedExtensions

So, correct method is:

public function _getAllowedExtensions() {
        return ['csv'];
  • its not necessary – Rk Rathod Jun 20 at 12:17
  • You can try this code! – Khushbu Jun 20 at 12:25
  • i'm also try this – Rk Rathod Jun 20 at 12:27

Replace backend_model with this :-

  • this is not working! – Khushbu Jun 20 at 11:49
  • i think your controller is not called – Rk Rathod Jun 20 at 11:51

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