I am unable to import CSV file. It shows error even all the SKUs are got from the products on the site.
We assume that the cause of the issue is due to your SKUs include a special character as "–" instead of "-".
Hence, please edit this file: var/www/.../vendor/bsscommerce/fast-order/Controller/Index/Csv.php - add line 139: $arrLine = str_replace('�',"–",mb_convert_encoding($arrLine, "HTML-ENTITIES", "UTF-8"));
For more information about product, please refer Magento 2 Wholesale Fast Order page.
If you need any further assistance, please feel free to contact us.
Please visit our site for more useful Magento 2 Extensions: https://bsscommerce.com/magento-2-extensions.html