file upload

Sounds like you should go to my old long-standing Feature Request and click "like" on it, and add a comment in support to amplify it and float it back to the top of Community for greater visibility.  As far as I know, this is in Appian's "product enhancement backlog swamp" along with tons of other useful quality-of-life tweaks, to my chagrin.

I will let you in on the lesser-known fact, though, that the "get content object details by ID" function from the Content Details plug-in, CAN be fed a Doc ID and WILL return a text string containing the (full, un-parsed) filename, even for "newly uploaded but not yet submitted" documents.  With a bit of work, this is a supported workaround that can help with your use case, though you must do it carefully and anyone who attempts this should first have a thorough understanding of how Expression Rules work in general.

Sounds like you should go to my old long-standing Feature Request and click "like" on it, and add a comment in support to amplify it and float it back to the top of Community for greater visibility.  As far as I know, this is in Appian's "product enhancement backlog swamp" along with tons of other useful quality-of-life tweaks, to my chagrin.

I will let you in on the lesser-known fact, though, that the "get content object details by ID" function from the Content Details plug-in, CAN be fed a Doc ID and WILL return a text string containing the (full, un-parsed) filename, even for "newly uploaded but not yet submitted" documents.  With a bit of work, this is a supported workaround that can help with your use case, though you must do it carefully and anyone who attempts this should first have a thorough understanding of how Expression Rules work in general.