Why does it only take 30 seconds to download?
Most likely, you either do not have a subscription or the subscription was not activated during the installation of the application. In this case, Yandex can only give you access to the demo version of songs for 30 seconds.
If you do have a subscription:
➤ Try re-logging into Yandex Music and reloading the page.
➤ Try reloading the extension (Off-On on the browser extensions management page)
➤ Make sure that the browser is not in Incognito mode or under VPN (which may interfere with the correct operation of the application)