Step 1 — Download from NSE

Go to the NSE option chain page, select your underlying and expiry date, then download the CSV.

• The page always opens with NIFTY and the nearest expiry selected by default — change both before downloading
• The downloaded filename contains the expiry date — the app uses this to identify it automatically

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Step 2 — Upload the CSV

Come back here after downloading and upload the file. The expiry date is read automatically from the filename.

• Windows: click Date Modified in the file picker to find the latest download
• Mac: press ⌘ Cmd + 2 to sort by date