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The Dropbox App file display / editor is a welcome tool on mobile devices. However, it displays text files (.txt) in a proportional font. If you are only going to show one font it should be monospace...
The alignment from line to line that Robert speaks of is exactly why fixed-width font(s) are so useful. Anyone who plays guitar, ukelele, banjo, madolin, etc is familiar with chord charts where the chord on the upper line is directly over the lyric on which it occurs.
IME, .txt files are almoast synonymous with fixed-width fonts (as in Notepad for example) and looks like your competition (Google, Microsoft, Adobe) all agree. When I make a file in Notepad that is in fixed-width (Courier) I expect it to appear that way... as it does in my browser (Chrome) or if I download it and open it in Notepad. It is only in your App that it doesn't.
Perhaps you don't like musicians?