"Cannot find central directory" with project files in folder

Question

Got this error when trying to create a project with many files in a three-tier folder structure (nothing that Studio shouldn't be able to cope with). It's just regular PDFs and docxs. Studio threw the error with regard to some .docxs, which import correctly after adding them directly (not in a folder). So the problem seems to be the folder structure, which I wish to preserve, however. Yes, I can work around this issue, but why should I. 
 Any ideas?

Paul · Answer

Adrian Komiński 
 Can you provide the error information? That might point to something. In the meantime I tried to repro with a ten tier nested structure and this seems to work without a problem. There are probably an infinite number of scenarios I could apply to this project but without any details from you at all to help it's tricky. So the best I can do at this stage is just see whether there is a problem with nested folders. In general I can only conclude there is not.

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"Cannot find central directory" with project files in folder