I'd agree automatic guessing is dangerous, but an explicit (default off) option to allow upload in other countries doesn't seem like a risk. You could even put

I'd agree automatic guessing is dangerous, but an explicit (default off) option to allow upload in other countries doesn't seem like a risk. You could even put some wording round "hey this will cost you data" and offer an automatic turn off after a set period. Dropbox's current approach is just mis-understanding their market. In Europe there's no such thing as roaming fees (well unless you're in post-Brexit UK), so at least they should offer the option for european installs.