Set Document Expiration

As far as I know this feature has been deprecated - and in my experience it was hard to use well in the first place due to such low visibility and basically no warning upon expiration, etc.  I strongly recommend if you need some sort of automated document expiration, you handle it in your documents database table and build a process that can handle removing documents if/when needed.  This does require your in-Appian documents to be recorded to a database table you design, but I always strongly recommend that to be done anyway, since there are many things that are very hard to do without it.