what is the option 'connect to server'

code_craft wrote:

in file, under either icloud drive or on my iphone there is a menu ... upper right corner , in this menu there is an option, connect to server,

click it and it suggests an email address. what email address gets placed here? my icloud email?

"on my iphone"...(?)

I would suspect the email you use for your AppleID — try it and see

Check your Apple ID device list to see where you're signed in

Check your Apple ID device list to find where you're signed in - Apple Support