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Zilla is easy to use Flickr uploader that enables you to upload photos and videos to an existing Flickr album. Here's how you can upload a whole new set of photos as well videos to an existing album.
1. Connect the folder that you want to upload to your Flickr account.
2. Click the little 'Album' icon and a pop-up window will open up. Now you can choose to upload the connected folder to an existing Flickr album and then click 'Save'.
3. After that click 'upload' button located at the bottom-right corner of the screen.