No matter on a computer, tablet or phone, now you can easily sync Amazon Cloud with Android/Windows/Mac device directly from your browser with a free web application - MultCloud. MultCloud puts all cloud services in one place so that you can transfer files from one cloud to another with only one login. For example, it’s possible to backup OneDrive to Amazon Cloud Drive or S3 and vice versa. The tool also allows you to connect multiple accounts from the same provider. What you need to do for Amazon Cloud Android sync is just adding your accounts in use into MultCloud.
*Update: MultCloud added a special Cloud Sync service now, you can use it to do sync cloud drive task directly. MultCloud provides 8 normal sync ways.