PDF are not downloaded automatically

In most cases, I have a problem to download pdf directly with the Zotero connector and I have to download them manually. For example these articles:
https://www.sciencedirect.com/science/article/pii/S0028393217302440?via=ihub
https://www.nature.com/articles/s41598-018-20676-8
Debug ID for article from ScienceDirect is D1500193028
Debug ID for article from Nature is D1411498706
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