Why I cannot attach .pdf file in MQL5 message...?

[LEONG KAH LOON]

Why attach file in any service of MQL5 is unable to attached .pdf file. It's very inconvinent for most of people. 

[Vladimir Karputov]

These are the rules:

 

[Biantoro Kunarto]

You can compress your pdf file to zip file, and then you can attach that zip file.