On 2015-08-14 12:41 , Eric Weir wrote:
By “Flickr extension” do you mean the app?
Godfrey explained the concept; specifically you use the Flickr extension when you are viewing an image in Photos, you click the "send to" icon (square with an arrow extending up from it), and you choose Flickr — if the Flickr app has already been signed in, this is a quick way to upload a photo without launching the Flickr app
another relevant use for extensions is that some third-party photo apps offer their editing tools for use directly within the Photos app, so you can do more types of editing than Photos alone offers, but you don't have to launch another app, similar to third party filters in Photoshop; here's a list i googled up to give you some ideas what this means; i personally use Skitch, Afterlight and Camera+ this way
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