Cannot play WhatsApp PTT voice notes (opus format)

[firubat]

Checklist

• I can reproduce the bug with the latest version given here.
• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one bug.
• I have read and understood the contribution guidelines.

Affected app version

1.0.0

Affected Android/Custom ROM version

Android 13

Affected device model

Fairphone 4

How did you install the app?

F-Droid / IzzyOnDroid

Steps to reproduce the bug

1. Browse to "WhatsApp voice notes" folder via file browser
2. Enter one of the subfoldrrs and press on file named "PTT-xxxxxxxx-WAzzzz.opus
3. If prompted to select app, select Fossify Music-Player

Alternatively download the test file and perform same steps

Expected behavior

Music player should open and play the file.

Actual behavior

Music player opens but does not show the file and doesn't play it.

Screenshots/Screen recordings

screen-20250117-203923.mp4.2.mp4

Additional information

The file can be played in VLC, spotify, youtube music.

Seems that it happens only with the opus files created by WhatsApp with the PTT prefix. For example this older file plays as all other files.