Thanks. So I need to reduce the value at which the zip file should be split?
I checked updraftplus.php and discovered
// The smallest value (in megabytes) that the “split zip files at” setting is allowed to be set to
if (!defined(‘UPDRAFTPLUS_SPLIT_MIN’)) define(‘UPDRAFTPLUS_SPLIT_MIN’, 25);
Given that 25MB is the maximum attachment size for gmail, and the functionality means there’s a risk of creating a >25MB attachment (as per my original problem) wouldn’t it be better to reduce this minimum?
I’ve edited my copy of updraftplus.php and reduced the value but I need to remember to do this with every new version which is not ideal.