We don't have an official Flickr app for BlackBerry 10 and as always members of the BlackBerry developer community will jump in to fill the void - iGrann, Whine, Snap2Chat. Though, Upload to Flickr is not a full blown app, it does allow you to upload pictures to your Photostream or add to existing albums in your account. I used to be a pretty big Flickr user way back when. I still ocassionally upload to my account. With apps like this, it may make me use Flickr a lot more again.
Setting up the app is easy, when you first launch the app, you're prompted to login to your account or can create one if you don't have one already. It's free to sign up and you get 1TB of free storage -- so much more than you'll ever need.
Once you're logged in, just start selecting the photos you want to upload. When you've chosen your pictures you can choose where to upload them to - your photostream or any other existing albums. You can choose the default album in the settings within the app. You can also choose who will be able to see these photos - public, friends, family, etc.
Upload to Flickr is free to download, from the list of features above there are two that will require you to have a pro version - upload videos and upload multiple photos at once. However, if you want to upload directly to an album, this would also require the pro version. The pro version costs $0.99 and if you want those features, you're hardly breaking the bank.
I do like that I can now upload photos to my Flickr account. If you've been looking for an app that does it this on BlackBerry 10, then look no further. It does what is says on the tin - Upload to Flickr. Straight up. No fuss. It would be nice to be able to browse photos within your account. Perhaps this is something that can be implemented in time. It's free download anyway, so why not give it a try?