In case anyone else encountered this problem. You have to edit your function and check the "has return value" box. Then your return will work. After this you have to use "Call Function" again and now you have a new field for saving results.
Please, Problem Upload with API ( Attached File XML )
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Can anyone help me? I'm having trouble automating the upload of reel videos using an API like screenshots. Can you help me fix it so it works properly?

File Scrip Upload Video With API Upload Video With API.xml