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in thingworx flow, I found a way to download pvz resources. Anyway, most of the time, these files are too large and complex. Is there a way or a specific worker to reduce pvz dimensions?
That is a very good question for the CAD-specific forum (even if you speak of it in the context of Flow).
Whatever way to optimize there might be, it will be part of Creo, not Flow - maybe an utility of sorts.