If you want to backup photos from Google Photos to Flickr on iPhone, you need to download and install both the applications on your iPhone. Also you need to allow the Flickr service to access on iPhone. To access Flickr service, go to "Settings" app on your iPhone and tap "Flickr" tab and then move the slider from left to right to turn it ON. Once you set up, you can easily backup photos from Google Photos to Flickr on iPhone.
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