Hi Niko,

You can remove .txt and .doc there, and only allow images and PDFs by adding this PHP code snippet to your site:

add_filter('b2bking_allowed_file_types_text', function($text){
    $text = 'jpg, jpeg, png, pdf';
    return $text;
}, 10, 1);
add_filter('b2bking_allowed_file_types', function($types){
    $types = array( "image/jpeg", "image/jpg", "image/png", "application/pdf" );
    return $types;
}, 10, 1);

The first part of the snippet controls the text shown, whereas the second part contains the actual types allowed. 

Let me know if I can help with anything, or if you have any questions,

Kind regards,

Stefan

That PHP snippet can be added to functions.php, or by following our guide here: https://woocommerce-b2b-plugin.com/docs/how-to-add-a-snippet-php-or-js/