Hi. And thanks for your input, the blog post was exact what I where looking for. What I am facing is this part here, e.g. when moving flow between environments, the links to nested flowfiles needs to be updated manually / does not work. Think we will go for solution 1 for now and revert when there is an update. Support for embedded versioned process groups is not fully ready yet when you have multiple Registry instances and you need to export/import things between the instances. You can check the status on NIFI-5029.
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