I got your file and discovered an interesting thing. The file name begins with a “#” character which is causing a problem. I uploaded it to box, and had the same difficulty opening the file as you reported. I changed the file name by removing the leading # and the file opened fine and behaved normally.
We’ll add this item to our bug list and try to make sure this character is acceptable for file names in future releases. In the meantime, if you will avoid using this character, your files should be fine.
Thank you for bringing this to our attention.