Zotero OCR on M1 Macbook

I'm wondering if anyone who has the Zotero ocr plugin working on Mac (M1, Big Sur) could help me out. I can't get it working.

I've installed tesseract and poppler with Homebrew, installed the zotero plugin and set the path in the Zotero plugin to:


I can confirm that this where those files do live.

I've also copied the pdftoppm into /Applications/Zotero.app/Contents/MacOS/pdftoppm according a recommendation elsewhere on this forum, although I have tried to run the ocr with and without this step.

When I run the plugin, an ocr file appears but when I try to open it I get the following error:

Format Error: Not a PDF or corrupted.

PDF.js v2.8.146 (build: 7dd64325d)
Message: Invalid PDF structure.

Help? ...
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