[imp] How to add attachments in IMP 4 during Message Composition

[Fred Ho]

Hi,
   In released Horde 3/IMP 4, how do I add attachment during 
compose? I no longer see the [Browse] [Attach] buttons for 
adding attachments as in IMP 3.

BTW, how does the "Link Attachments" works? I set it to true
in conf.php and the compose window put out a check box for 
"Link Attachments", then what?

Thanks for any info.

Regards,
Fred