add_filter("mime_types", "add_csv_plain");
function add_csv_plain($mime_types)
{
unset($mime_types['txt|asc|c|cc|h|srt']);
$mime_types['txt|asc|c|cc|h|srt|csv'] = 'text/plain';
return $mime_types;
}
add_filter("woocommerce_csv_product_import_valid_filetypes", "add_csv_plain_woocommerce");
function add_csv_plain_woocommerce()
{
return [
'txt|csv' => 'text/plain',
'csv' => 'text/csv',
];
}