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You Cannot Override Admin Files Directly In Your Theme. You Need Custom Module For Overriding Admin Files OR Use Existing Custom Module. <?xml version="1.0"?><page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd"> <...


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If you allow only CSV and xls file upload then you can add the method beforeSave into the CustomFileType.php and write the exception based on your file type. class CustomFileType extends \Magento\Config\Model\Config\Backend\File { /** * @return string[] */ public function getAllowedExtensions() { return ['csv', 'xls']; } ...


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step 1: add your column into the ui_component file sales_order_grid.xml <?xml version="1.0" encoding="UTF-8"?> <listing xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd"> <columns name="sales_order_columns&...


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