Nope, sorry. We used to have that feature, but it was removed because of security concerns – there is no way to safely store the password in the underlying .XML config file.
If you don't mind that the password does not remain a secret, your best bet would be to create a UEM logon task, and call net.exe use \\192.168.123.42\abc /user:DomainName\user123 1234.
The Windows API needs a plain text password, so the UEM agent needs to be able to decrypt whatever the Management Console encrypted. There's no way to share secrets between the Management Console and the agent, so that will never be secure.
We've found that most customers control access to file shares via group membership instead of explicit credentials – would that be an option for you?