I am wondering if time-based workflow rules cause triggers to fire. The use-case is I use a trigger to look for a field to be checked and then send an email out via a trigger (workflow rule is not an option because it requires BCC addresses). The email also looks for a particular attachment in the notes and attachments section of the opportunity. This attachment is automatically uploaded via a third-party, but it takes a few seconds for it to show up... currently, the email gets sent out before the attachment is uploaded.
I am wondering if a time-based workflow rule to update a field on the opportunity will still cause the trigger to fire. If so, I believe this would solve my issue of the email being sent out before the attachment is there.