Limit Wall upload By Member Type.

yzc_limit_wall_upload_by_member_type.php

<?php
/**
 * Limit Wall upload By Member Type.
 */
function yzc_limit_wall_upload_by_member_type() {
    
	if ( current_user_can( 'administrator' ) ) {
    	return true;
	}
	
	// Get User Member Type
    $member_type = bp_get_member_type( bp_loggedin_user_id() );

	
    if ( 'author' == $member_type ) {
    	return true;
    }
  
    return false;
}

add_filter( 'yz_allow_wall_upload_attachments', 'yzc_limit_wall_upload_by_member_type' );