Hi @lubos, to me it seems like a good option to include the possibility to attach a default document, PDF, or image to the email templates (such as the general terms and conditions). So, if you agree, please consider to add this to Manager, thanks.
Is it that hard to manually attach it? You could also use Footers for general terms and conditions.
While it is something that the program does not do right now, it is not that hard to get the desired results with current features, so why add it?