PDF attachments not saving on ipad

I am trying to save articles from Science Direct. I am using Chrome on my iPad. I share the page to zotero via the browser share button, but the pdf attachment doesn't save. It shows a little red x in the corner of the pdf icon on the share screen. The item saves to zotero but just with the link to the web page, not with the pdf file attached.
https://s3.amazonaws.com/zotero.org/images/forums/u18291955/z1gzx3tpob6s2wylxb14.jpg
https://s3.amazonaws.com/zotero.org/images/forums/u18291955/7nvcdmxr0hfrsg137e6b.jpg
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