I think it is because "sanders_2003_from_transactional_to_transcendental . pdf" has a space between the dot and the pdf. That is why you see in debug the "list_failed_adds".
Try renaming it in Zotero, and then reexporting the CSV.
Also, the Zotero CSV file must be untouched by human hands at the risk of corrupting it. It must be the originally exported CSV file still in UTF8 format. Excel corrupts UTF8 formatted CSV files. Do not use Excel. Fix Zotero, not the CSV.
Having said that, LibreOffice Calc saves CSV files properly in UTF8 if you specify the "filter" option when you save. I used Calc a lot to create test data for ZMI. However, I still think it would be far preferable to fix Zotero using one of its plug-ins, such as Zotfile, to change all ". pdf" extensions to ".pdf".
Hope this helps.
DaltonST
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