I could not get my Amazon account sync'd with my Shopify account. I asked for support through email and through the web form but received no response in five days. I will be deleting this app now.
We apologize for the delayed response. Our latest updates have worked on the issues you've mentioned and the same problems have been resolved. If other apps don't seem to be working well for your brand, do give our app another shot. We're sorry for the inconvenience caused in the past.