The correct answer is that you should download but you should check that the download worked properly and that all the fields downloaded correct data. When computers transmit data, it is in long strings of letters and numbers. A microsecond pause in a network can cause those numbers to be corrupted and not import correctly. Most of the time, there is no problem. You are the one time in a million billion that the numbers did not transmit correctly. So import for convenience but double check the results for accuracy.
