Content is not allowed in prolog. How to solve this problem with Yandex?

Question

Yandex

I use export to Yandex-work.
For some reason, Yandex stopped accepting xml over 300 mb, so I decided to add compression.
When sending a file to the Yandex validator, I constantly get the error Content is not allowed in prolog.
I have already removed everything that could be removed from the file to exclude any characters or spaces, and Yandex still swears.
What to do ? Thank you .
You can try to upload the file https://dropmefiles.com/eOtur to yourself in xml - a validator in Yandex