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in magento 2.3.1 below code is work

<field id="file_upload" translate="label" type="Magento\Config\Block\System\Config\Form\Field\File" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
    <label>Upload File</label>
    <backend_model>Magento\Config\Model\Config\Backend\File</backend_model>
    <upload_dir config="system" scope_info="1">customUpload</upload_dir>
</field>

but in Magento 2.3.3 this not working it give error

Invalid parameter given. A valid $fileId[tmp_name] is expected.

enter image description here

  • If is not Magento 2.3.3 issue. Because I've used same code in my M2.3.3 and it is working fine. Can you please use this configuration anywhere else and check ? – Kishan Savaliya Oct 16 '19 at 18:00
  • Hi @KishanSavaliya i used this configuration in my custom module where i getting this error also i test this code in local – chandresh chauhan Oct 17 '19 at 4:03
  • can you please check you exception.log or system.log in var/log directory ? From where you're getting this issue ? Is that your any custom module or default magento file ? – Kishan Savaliya Oct 17 '19 at 4:08
  • no i have install new magento 2.3.3 and also magento core functionality in configuration -> Sales -> Invoice and Packing Slip Design -> Logo for PDF Print-outs (200x50) not working , in live server it's work but not in local – chandresh chauhan Oct 17 '19 at 5:19
  • You can check this image <drive.google.com/file/d/1WL17yXTjJDHOZk8IVaEhwCelyIpSonUu/…> I just updated that image here which you've mentioned here. And that is working with default Magento 2.3.3 version. – Kishan Savaliya Oct 17 '19 at 7:45
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i got the issue in file Magento\Framework\File\Uploader.php in which new method was added so i just comment that method, in function _setUploadFileId($fileId) found the

$this->validateFileId($fileId);  

change to

//$this->validateFileId($fileId);

it's work in my case in local server

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