Keyfile - Where to keep it? What is it for?

I am using Boxcryptor classic.
When I installed boxcryptor it placed "keyfile.bcx" in the shared folder.

Where do I need to keep this file?
Does it have to be in the shared folder? (which one)
What happens if I take it out?

Thanks in advance.

Hi Jayrick,

Every BoxCryptor Folder contains a configuration/key file.

Please read the following information:
https://boxcryptor.desk.com/customer/portal/articles/565947

Best regards from Germany,
Philipp