Maximum allowed number of uploads

function streamtube_child_check_limit_uploads( $errors ){

    $max_allowed                = 10;

    $current_user_total_posts   = count_user_posts( get_current_user_id(), 'video' );

    // Check roles ... etc

    // This limitation should not apply to administrator and editor, maybe.

    if( ! current_user_can( 'administrator' ) ){
        if( $current_user_total_posts > $max_allowed ){
            $errors->add(
                'not_allowed',
                esc_html__( 'You have reached the maximum allowed number of uploads.', 'streamtube-child' )
            );
        }
    }

    return $errors;

}
add_filter( 'streamtube/core/upload/video/errors', 'streamtube_child_check_limit_uploads', 100, 1 );
add_filter( 'streamtube/core/upload_chunks/video/errors', 'streamtube_child_check_limit_uploads', 100, 1 );
add_filter( 'streamtube/core/post/import_embed/errors', 'streamtube_child_check_limit_uploads', 100, 1 );