You disagree that a Franks motion doesn't need to be filed? I guess you will have to take that up with the Indiana legislature, because they specify motions not made in hearing or trial
must be filed.
_Rule 7. Pleadings allowed -- Form of motion
...
(B) Motions and other papers. Unless made during a hearing or trial, or otherwise ordered by the court, an application to the court for an order shall be made by written motion. The motion shall state the grounds therefor and the relief or order sought. The requirement of notice is satisfied by service of the motion."