Re: does windows phone email allow multiple file type attachments directly in the mail program
Yes, you need to use a file manager such as files, aerize or pocket explorer or a third party e mail client such as metro mail (download link -
MetroMail | Windows Phone Apps+Games Store (United States)) at present as you can only share one document at a time via the office hub and there is currently no way to access documents via the embedded email client in windows phone.
Yes, this is a gross oversight however personally you should really be sending secure links such as Citrix Sharefile and to a lesser extent OneDrive. As these avoids issues with mixed up attachments, incorrect subject lines in emails etc.
Not to mention sharing secure links prevents issues arising where the attachment is far too big to download or send and is more efficient for collaboration on projects (via office webapps with OneDriver), prevents the need to have the information stored on all your devices as it can be pulled down from one central place when needed.
However you need to discipline yourself and colleagues to not deviate from this process otherwise the ensuing fall out would not be a pretty sight (especially true for time constrained projects).
Edit:
Added to for clarification, if you try to attach a document inside an email via the built-in email client it will divert to the photo hub. This behaviour is also true after you have attached a document via the share option in the office hub.
Also to share videos you need to use a file picker and share via email or use MetroMail.