Sun Sep 15 2019 14:36:43 UTC
Oh...is this a bug now??!!! It was called a change request the last time I checked!
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ID Product Comp Assignee Status Resolution Summary Changed
49223 JMeter HTTP issues RESO DUPL Parameters do not work in the "Send Files with the Request" Field 2010-04-29
One bug found.

as

File a new bug in the "HTTP" component of the "JMeter" product