# Student's custom sounds won't play after moving from App Lab to Lesson

**URL:** <https://forum.code.org/t/students-custom-sounds-wont-play-after-moving-from-app-lab-to-lesson/37244>\
**Category:** Coding and Debugging Help\
**Tags:** csp-unit-3\
**Created:** [November 16, 2022, 7:32pm UTC](https://forum.code.org/t/students-custom-sounds-wont-play-after-moving-from-app-lab-to-lesson/37244 "2022-11-16T19:32:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![acrawford-kleyn](https://avatars.discourse-cdn.com/v4/letter/a/c37758/32.png) [@acrawford-kleyn](https://forum.code.org/u/acrawford-kleyn)\
**Post date:** [November 16, 2022, 7:32pm UTC](https://forum.code.org/t/students-custom-sounds-wont-play-after-moving-from-app-lab-to-lesson/37244/1 "2022-11-16T19:32:54Z")

</div>

Student imported his app for Unit 3 from App Lab to Unit 3 Lesson 10 to submit. He imported the screens and all of the sounds/assets as well.  
He then copied and pasted the code from App Lab to Lesson 10.  
The “resident” sounds from [Code.org](http://Code.org) all work, but none of his custom sounds play.  
The sound files are all intact. I’m stuck.  
Any thoughts?

---

<div class="post-metadata">

**Author:** ![wutadam](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.code.org/wutadam/32/7711_2.png) [@wutadam](https://forum.code.org/u/wutadam)\
**Post date:** [November 16, 2022, 7:39pm UTC](https://forum.code.org/t/students-custom-sounds-wont-play-after-moving-from-app-lab-to-lesson/37244/2 "2022-11-16T19:39:24Z")

</div>

Are they locally referenced? That would mean just entering the filename, like this:

```javascript
playSound("example.mp3");

```

You might want to try externally referencing them, which would require you to prepend the storage URL for each one in the code. The storage URL looks like this:

```nohighlight
https://studio.code.org/v3/assets/channel_id/

```

Replace “channel\_id” with, well, the channel ID of the original project. That would be the long string of gibberish found after

```nohighlight
https://studio.code.org/projects/applab/

```

Make sure not to copy the /edit or anything at the end like that.

After you have your channel ID, which in this case, I’ll use “jfuekfj”, the storage URL should look like:

```nohighlight
https://studio.code.org/v3/assets/jfuekfj/

```

Then, you’ll need to go through every `playSound` block and put the storage URL in front of the URL. This can be a hassle done manually, so go into text mode, press Ctrl+F twice, and enter this in the first box:

```nohighlight
playSound("

```

Enter this in the second box:

```nohighlight
playSound("https://studio.code.org/v3/assets/jfuekfj/

```

Make sure you don’t use “jfuekfj”, but the original app’s channel ID.

Then, click “All”. If that doesn’t work, just click “Replace” until the first box turns red.

I know it’s a hassle, but that’s the only way I know for sure works.