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How to change/update the JS of the header-widget

Hello everybody
First and foremost: sorry for the newbie-question :)
I took over a cx project and am a bit at loss how to update/change files.
There's an error on the front page, saying that a JS method is missing.
So I downloaded the widget (under Design -> Components -> filtered for «header» -> downloaded the instance).
Then I added the missing methods to the JS-file.
But now I have no idea how to upload the changed files.
I tried it under Settings -> Extensions -> upload extension.
But there I get tons of errors, mainly one that says that ext.json could not be opened as well as some warnings claiming that the path is wrong (mainly the __MACOS/... paths)
I'm sure I'm missing something obvious.
Any advise for a newbie?
I'm using a Mac, btw, if this matters.