Specifically The Van Til audio resources, though I think there may be other collections for which support would be appreciated.
The Van Til product is still shipping, thus this seems a reasonable request.
I've added a request to the mobile apps UserVoice forum.
Please cast a vote.
https://logosmobile.uservoice.com/forums/190765-logos-mobile-apps/suggestions/7053939-add-support-for-all-audio-resources
Just so you know, there are a lot of audio resources and out of the nearly 48,000 resources we currently have I don't know which audio ones don't work on mobile. In other words, your suggestion might never be fully completed but I'll write up a case for the Val Til resources.
Checking, I found that the file of Van Till audio resources now has a .logos4 extension (CVTAUDIO.logos4).
I am hoping that all currently shipping audio resource file formats will be supported. Alternatively re-formatting currently shipping resources to a supported file format, as was done for previous desktop app updates, could resolve this.