In order to upload your collection, launch Hearthstone Deck Tracker or HSTracker along with Hearthstone. Click on the "My Collection" button in Hearthstone, and after a few seconds, you should see a banner notifying you that it's been uploaded to our server.
First of all, make sure that you've updated your deck tracker application to the latest version. If a new expansion or update has released recently for Hearthstone, you'll need our latest update to enable collection syncing.
A common issue with this is when the deck tracker gets out of sync with HSReplay.net. Perform the following steps: