I have photos stored in Dropbox. I want to move them to Google Photos. I don't have enough free space on my hard drive to download them all and then upload them all. Is there any way to move them directly from Dropbox to Google Photos?
I solved it in no time with https://app.mover.io/ (freemium. I used it once to do a massive, one-time moving)
Just authorize both apps to be connected through the web interface and you're all set! You can see a progress report and in a few hours (I was moving 7-8GB) you'll have your files transferred.