When clicking "Upload a file" in audio tab when editing a card game, existing audio is removed

Describe the bug

When clicking "Upload a file" in audio tab when editing a card game, existing audio is removed without prompting the teacher if they want to remove it.

To Reproduce
Steps to reproduce the behavior:

1. Create a card game and add audio to a card;
2. Once audio is saved on the card, click the "Upload a file" button;
3. Note that the uploaded audio is removed, and you need to click "Upload a file" again to switch to the upload view.

Expected behavior

The teacher should be prompted if they want to remove the existing audio, if there is audio. Otherwise, they should be able to switch without a prompt.

Screenshots

Audio recorded and saved

Clicked "Upload a file"