I know that TeX Users Group recommends putting your local texmf tree at
~/Library/texmf (see link). However, I want MacTeX to see my local texmf tree in a folder in my Dropbox. This allows me to refer to the same local texmf tree on multiple computers, which makes updating my local texmf tree easier (just update the version in the Dropbox and all the computers see the update).
How do I do this?
Note: I found some similar tex.stackexchange questions, but they don't answer my question.