Thanks for sharing your screenshot @cmprmsd!
This is indeed an error coming from Telegram and I am not aware of a workaround unfortunately. n8n uses the Telegram Bot API, which limits the file size that can be processed programmatically. According to the official Telegram docs it should be 20 MB:
For the moment, bots can download files of up to 20MB in size.
So it appears that Telegram has quietly increased this limit to 2GB, but not lifted it completely unfortunately.