[TxMt] How to copy a file?

I must be missing something really obvious here but I don't know how to do this most basic thing:

(1) Drag a folder onto TM icon to open as project (2) Open an HTML file called index.html

-- Now here's the part that throws me ---

(3) Make a new file called index2.html based on the original index.html

My first instinct is to right click on the file in the project drawer and look for "duplicate file" or something similar - no such option exists. So the next thing I try is opening the file and using "Save as" to make the new file. This actually works but something weird happens: In the drawer, it has the effect of *renaming* my original file rather than adding a new one. If I switch to another application and then back to TM, the original file reappears. Is this expected behavior?

So what's the preferred method of creating a new file starting with a copy of an existing one?

Thanks!

Sean

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