Comment 94 for bug 823155

(In reply to Luke from comment #32)
> Julien's on the right track. If you create slide with an Animation Sound
> Effect and save it, it will work. If you copy that file to a different
> directory, the sound will no longer play. The reason why there was so much
> confusion over this bug, is that sound effect work until the file that they
> were created in is moved to a new location.

This is not true. If you create a custom animation with a sound effect from the LibO gallery *on Linux*, it will not work at any point. You don't have to save, you don't have to move the file - it just won't work. I can reproduce this from scratch on Arch Linux with 5.2.3 / 5.3 and Ubuntu with 5.2.3. Same for version 3.6.7.2 on Arch.
On Windows it works perfectly.