remote-resources do not seem to work with media overlays

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I have been trying to make media overlays work with external-resources audio but can not get it to work. I am using readium, in case this is relevant.
Here is what I am doing:
- I am adding an item in the manifest pointing to the external audio. I am also adding properties="remote-resources" to the smil item
- In the smil file, every audio element now points to the external resource

When I load the epub into readium it shows me an audio player on the readium panel and lets me click on any of the words (Which get highlighted) but neither pressing play or clicking on the words plays anything.
I thought it was the size of the audio file, but I also tried with a small file and the same happens.

Should I resolve that it is not possible to use it?

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