As Craig says (says), the Wait For File activity does not support wildcards. However, such a routine would be easy to write, and could be invoked from a Routine activity.
In a loop, execute an operating system command to list whatever the wildcard refers to, and to return if the number of items listed is more than zero. Include a short SLEEP (or a NAP) in the loop so that the routine does not become a CPU hog, and handle the timeout sensibly.
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