Name of the attached file. The file name can be composed of a "fixed text" and variable
text items.
e.g.
Temp%j.zip means that the file name has a name with a consecutive number on every day:
temp210.zip on the 210th day of the year.
We recommend you use normal extensions for the file name:
a compressed file has a .zip extension,
a file in html format has a .htm extension,
a file in csv format has a .csv ending,
a file in xml format has an .xml format,
a camera picture has the ending .jpg or .jpeg