Thanks for you comment.
I talked to the backend guys and they will accept nested files in a ZIP, so we don't need third party libraries.
Thekakami
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@eskimo:
Your solution would be enough for me, if the parent directory would not be stored in the zip file.
If the URL is .documentDirectory then the extracted zip includes a "Documents" folder.
After some time of researching, I don't think, there is a solution for my problem.
I don't want to use a big third party library, only to remove the "Documents" folder.