Assign global scope to a variable retrieved within a reactive environment

Hi all,
I have looked to the documentation but I cannot figure out how to assign global scope to a variable.
In this specific case, the app asks the user to upload a file, then several operations are carried out on it with separated outputs shown in different tables.
I ended up repeating the same bit three times:

Is there a smarter way to open the file once and use it as global variable?

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