.... the stock (and I assume made by HTC) E-Mail app for anything that is not a g-mail account.... does not. It only allows Photos, Videos, Documents, Etc. There is a "File" option if you scroll to the bottom..... but this is practically the same thing as the above options, as it only lists recent files (only types it understands) or files sorted by type, etc. It doesn't let me browse the file system.
Is there any way to either choose any file I want, or add a file manager to the list, without basically downloading a different e-mail app?