iPad not syncing downloaded files
I just upgraded my storage for Zotero but my ipad will not sync downloaded files (I can't open them at all on the ipad) but all of these files are fine on desktop and browser. The debug ID is D2136057042.
It looks like you either uploaded files using WebDAV from another device (but have your iPad set to use Zotero Storage) or purged files in your online library for some reason. In either case, following the steps carefully will fix this for you.
All your attachments do have information online from being synced previously, so if you haven't used WebDAV, you likely mistakenly used "Purge Files in My Library" from your storage settings page. Once again, if you actually follow the steps on the linked page, the copy of Zotero that has the files would reupload them all and make them available online and on other devices. You just haven't done that.