When you (accidentally) close your browser during a recording, you will not lose the audio record.
The recording will however not be automatically uploaded to your Banafo account. To fix this, do the following steps
1. Open your browser again.
2. Click on the Banafo Browser Extension icon.

3. Click on the synchronisation icon in the right top corner.

You will then see your recording appear in your Banafo account in your Conversations.