Creating a Bitwarden attachment in the Terminal

Is there anyone here whom can help me to explain commands ? I am trying to create an attachment for Bitwarden ,but could not .

/bw create attachment --file ./Users/Vereb/Documents/securenote.txt --itemid 16b15b89-65b3-4639-ad2a-95052a6d8f66

I think I have the Item ID but how to know where this file is ? I do not need to be in a certain directory for this as bitwarden will create the attachment if I know the files location. /Vereb/Documents/securenote.txt - - thesse are imaginary signs . The item ID is also an imaginary one.

 From the item ID I cannot see in which directory it resides and I do not t know the file extension either.