The English translation(By DeepL.com) is at bottom of the page.
I thought maybe it was the iOS controls, so I borrowed my mother's Android device to try it out and found that it paused and resumed smoothly, so I went to GEO and got a used smartphone as soon as I could.
Well, on Amazon, you can buy a new smartphone for around 20,000 yen, so I was hoping to get one for less than that, but I found an Xperia XZ1 for 16800 yen that wasn't too old and I liked the design, so I bought it.
I immediately put in the Alexa app and listened to the voice on the Bluetooth neck speaker, paused and resumed the action, and it worked smoothly and without any problems.
The Xperia XZ1 itself doesn't have any noticeable scratches, and although it's a product that was released about three years ago, it doesn't seem to have any particular battery drain issues that used products seem to have, so I'd like to continue using it.
Still, I think that the iOS background app limits could be loosened a bit more.
Well, maybe it's just a matter of security and power consumption.
Translated with www.DeepL.com/Translator (free version)