Read an excel on node-red 2.26.1

Hi everybody,
I have just started to use node-red on a cloudgate and I would like to read an excel file on my PC (i dont know how import it on the cloudgate) in order to convert his colomn into a csv file that I can use on node red.
But this error show up : ""not permitted to read C:\Users\FARE INGENIERIE\Documents\Lorawan sensor connection\test.txt" (i tried with a .txt file here but it is the same with an xlsx)
I also tried to import new nodes through npm but when I import an .json file, it says : " Error : TypeError: Cannot read properties of undefined (reading 'substring')"
What can I do ?

I'm afraid that there are lots of things and organisations called cloudgate out there, you'll need to give us a bit more of a clue.

Never mind, I found it from the icon in your picture LuvitRED.

But that gave no more clue about how it works and what features it has.

You need to contact I'm unless there is another user of the service on here who can help.

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