If you want to sync photos from Dropbox to Google Photos, then you need to download and install both the applications on your computer. Once you have installed Dropbox app on your computer, go to "Preferences" and then Select "Selective Sync" options and then check the folders which you want to download. Now all your photos will now be downloaded to your local storage. If you want to upload photos to Google Photos using desktop application, you need to store your photos on your local hard disk. Now, go to the "Google Photos Backup" app and click "Preferences". Click "Add" button and browse to that Dropbox folder to add it and then click "Start Backup" button. This is how you can syn photos from Dropbox to Google Photos.
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