(VPN) Can a remote host know the real IP when downloading a file through a browser?

Question

VPN

Good day, dear toasters!

I always use a VPN for anonymity. You need to upload files to the site through the browser. Is there any way for the remote machine to know my real IP?

Thanks to everyone who takes part!

Answer 1

Only if third-party applications are used (Flash for example), AJAX and HTML will not give out your real IP.

Answer 2

Open https://whoer.net/ru and see what the site can learn about you.
Pay attention to WebRTC and Flash.

Answer 3

It really depends on what you're downloading.
And how is the OS configured?
If the OS does not let you past the VPN, then everything is fine.
If your file downloader works on the same channel as the browser, then everything is fine.