Hello,
I finally got it.
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So I had to make HTTP Request with Parse response activated.
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Then I had to transform to JSON (thanks for the tip)
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Then the data was ready to convert from JSON to XML
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From here i could finally upload the XML into a file via SFTP
So before, I was saving a file but not in the JSON format even if it looked to me it was JSON, that’s why I was missing all the steps and getting all sort of errors.
From the HTTP Request I was just getting a Collection instead a JSON string as I always thought
Only with the Parse Response and after JSON transformation I got a JSON string to work with
This is the final scenario
Please ignore the last message and thanks to all that tried to help.