Sound should stop playing when imported from library

[chexbox]

Expected behavior

Sounds should stop playing when imported from library.

Actual behavior

The sound continues to play when imported from library.

Steps to reproduce

Open a sound from the sound library. (I used "eggs")
The window will disappear and the sound will upload, but the sound continues to play.

Operating system and browser

ChromeOS, Chrome; Most Recent Version

[thisandagain]

/cc @ericrosenbaum