Question about site integration with telegram?

Question

PHP

Friends who worked on APi with telegram?
The initial data left by the previous developer.
There is a server on Debian 10.
Judging by the history, this application was installed
https://github.com/tdlib/telegram-bot-api

It worked in conjunction with WP, sending an audio file (from 100mb to 200mb) with a description in the telegram channel.
Recently this functionality stopped working, useful to understand.
He sent the request not to https://api.telegram.org/bot
, but to a subdomain. Through which the application apparently worked.

The question of such a plan, sent a request to https://api.telegram.org/bot
I am logging sending a file with a description.
I get a response in the logs

Responce: '{"ok":false,"error_code":413,"description":"Request Entity Too Large"}'

Sends only an audio file less than 50 MB.
The question is, how did it work before so that it sent files of both 100 and 200 mb?
Previously, I did not work with telegram api, well, judging by the docks, the maximum size is 50 mb.

Are there ways to send heavier files?