Find available PDF regularly reverts to preprint
I noticed that Zotero regularly attaches arXiv or other preprints even when the version of record from the journal should be available (through the institute network, no proxy). This particularly happened to me for APS (Phys. Rev. family) journals. It seems to happen quite randomly - sometimes the published manuscript is downloaded and sometimes the preprint. If I delete the attachment and do 'find available PDF', it usually gets the published version though.