There is no direct way to transfer photos and videos from Dropbox to Google Photos. You need to use computer to transfer photos and videos from Dropbox Carousel to Google Photos. First download your photos and videos from Dropbox Carousel to computer and then upload them from computer to your Google Photos account. There are two ways to upload photos and videos to Google Photos. You can use "Google Photos Backup" desktop application to upload photos from computer to Google Photos account.
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