Are you tired of downloading a kinds of applications on computers, phones or tablets just in order to transfers files between cloud storage like transfer photos from Amazon Cloud to Google Photos? If so, might as well try a free file transfer online tool - MultCloud which is especially designed for multi cloud management. With one-time login in MultCloud, no matter Amazon Cloud to Google Photos or vice versa, transmission will be completed easily through your browser like doing copy&move in Windows Explore. You just need to add accounts in use.
MultCloud also supports adding several accounts from the same provider. For example, you can set Google Photos backup to multiple accounts.
*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.