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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...
Mono space font should be the default - if you have report in text with columns that is dependant upon fixed font spacing , it is virtually impossible to read it properly quickly and it is not the purpose of Dropbox to make our lives easier? Major priority issue in my book.