Cloud Sync - Exclude Based on Max File Size Not Working

Hi all - I’m hoping to use a cloud sync task to backup my files to Box, but there is a 50GB file size limit imposed by my Box account. As such, I’ve been attempting to exclude files larger than 50GB from the cloud sync task as shown below and as described in the rclone docs, but no luck. I’m sure I’ve just misunderstood the syntax, but I’ve been unable to find any working examples by searching Google and the legacy TrueNAS forum. Any help would be greatly appreciated.