I don’t think you “changed” your password to access your account, I think you “reset” your password.
A password *reset* (where you do not know the old one, and instead get a new verification email, and then set a new one without ever knowing the old one) of the account will gain you access to the account as such, but not to encrypted files.
A password *change* (where you first enter the old one, and then set a new one), will enable you to open your old encrypted files with the new password.
To open any encrypted file you need to know the original password, or the password that it has been *changed* to.
There is no way to reset it to open the files, or to send it to you.