Problem reading MimeAttachement in vCO/vRO

Hi,

i'm using vCO/vRO version 5.5.2 and i got a workflow that rung on a daily schedule (or would like it to do).

Problem is that once the MimeAttachement is read the first time it never actually reads it again even though we update values within the file.

If i edit the WF and select the file again it reads the new content.

How can i implement this to happen on a daily basis from the scheduled task or clear the vCO cache?

thanks.