Forward slash in file names is the way to go if you want to make a mess in your filesystem. It may be allowed in windows (I don’t even know if that’s really the case), but it’s a path delimiter on Linux, so it’s probably replaced by another character that’s not printable in the console.

I suggest you try renaming your files before sending them, with hyphens (-) for example, plus you can use a proper ISO8601 date and time representation that will allow you to have sorted files just by listing them in alphabetical order.