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Arduino nextion data logger - open and show .txt fole

Hello, I am just trying to make some kind data longer, page 1 have button, after press I am opening page 2 with full screen text box, idea is to open last file on sd card and show content. Any advice on part of code, as serial monitor has no issues but text box of lcd shows just file name? Thanks
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discover by reading, this one closed Nov 15, 2017.