It's a potentially valid question, but one that you need to direct at STV - it's their app.
https://www.stv.tv/info/contact lists enquiries@stv.tv as a contact address
If it's anything like the ITV & C4-branded apps, then the vast majority of the content is available on all platforms but there are examples where that's not the case. Again, STV should be able to confirm.
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