can't jump inside .webm and opus
.webm container is supported. However, when it contains opus audio you can't jump inside the file and location is not remembered. This is a common download format for content downloaded from youtube and other streaming sites.
Playback is managed by the device built-in player, not by the app. This issue means that the device doesn’t fully support the file encoding. In that case every app relying on the device player will have the same issue. Sorry I cannot be more helpful
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@Tim
As explained in my answer, the device handles the playback not the app. There's nothing I can do if the device doesn't fully support this encoding. Only apps using their own engine might be able to handle this -
Tim commented
I have Android 6.
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Tim commented
What I meant to say is that location is remembered, but the app doesn't jump to that location.