That functionality is not enabled for mobile
When trying to add a new site location to a related company in mobile QuickBase, I select <Add a new site...> from the drop down list, but then I receive the error message that this functionality is n...
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Unfortunately, thats a feature we haven't gotten around to implementing in mobile yet. The only workaround is to create a new site by itself (outside of a company). Then you can go back to your original company and the new site will appear in the dropdown. Its not as streamlined but it will get the job done.