How to prevent telegram from collecting any information from my VM?

Currently am trying to use telegram anonymously right now, I am going to buy a VOIP number with monero, all my VM traffic is being routed through the tor network, so telegram figuring out who I am is no issue, however running telegram on my VM is, I am unsure of what information telegram collects and stores and am worried they will read my files. Anyway to prevent this? I would use the web browser but I am buying a one time VOIP number, and using a web browser (tor) would erase my cookies and make me have to verify the number again to log in.