I am no expert but looking at the CSV upload example, once the CSV is uploaded, you just need to store the path somewhere to that CSV in your model.
Then, perhaps you could either pass that path at the same time you upload it to the processing you want to do or have a button that you can click which triggers an operation based on the path.
The above CC’d are the experts in Genie!
P.S. This is a pretty fun problem - let me tinker on this this evening and get back to you with an idea.