how to add file name as an attribute in your dataset?

hellomotohellomoto Member Posts: 5 Learner I
edited September 2020 in Help
I am using loop files and append superset operators to stitch time series historical stock data from thousands of csv files together, each stock has a different csv file, and I am able to successfully do that but I also need to add stock name or file name as an attribute to every row which will act as an ID for every stock. I have been stuck at it for days. Any help would be greatful.

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