Zotero can not synchronize large files via WebDAV (ca. above 30 MB) - bug ID: 2035621772
In the cited report, an error occurred while synchronizing a 438 MB pdf file. I don't know if it's about Zotero or pCloud which is a connected service. I have a paid pCloud plan, so there should be unlimited number of files and unlimited file size when syncing.
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dstillmanedited December 21, 2022You're getting an HTTP 429 Too Many Requests error from pCloud. You'd have to ask them why.