Yandex YanDisk Over WebDAV Does Not Appear To Work or Update

It looks like perhaps Yandex are limiting or breaking WebDAV compatibility here:

https://ru.stackoverflow.com/questions/1043523/После-загрузки-файла-на-Яндекс-Диск-по-webdav-происходят-паузы-по-60-секунд-на-к

https://qna.habr.com/q/677787

We would suggest you take it up with Yandex, as Strongbox can only support WebDAV properly.