Adding another domain to FMP?

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What is necessary to add a second domain to fmp pages? Example:

machine.com/newdomainfolder/FMPro?-db=...... works for as many as you want, but newdomain.com/FMPro?-db=..... causes an error of "specified module not found". The fmp/web/newdomain folder is webshared as FMPro to the new domain just like the web folder is webshared to the machine.com. Would just like to have new domains show their own domains instead of redirecting to machine.com/domainfolder....

Any ideas? Thanks.