Since a number of people are having trouble sharing replays, please refer to the image above to properly share replays here.
Step 1: After the match is over, do not exit out of the battle screen.
Step 2: Click the “Upload and share replay” button circled in red
Step 3: A pop-up window will appear with the replay URL. Copy that URL and either save it somewhere or post it here
Repeat for any other games
Here is a video walkthrough if the above doesn’t make sense: https://www.youtube.com/watch?v=kL17VSKdeG0