@warguelles: That actually wasn't us — ScienceDirect seems to have somewhat relaxed their anti-bot measures. So this will hopefully now be fixed for everyone, including people not on the beta.
We did, however, just make major improvements to attachment saving in the beta that were specifically intended to fix this (and similar problems). And they'll still help if ScienceDirect restores these measures in the future.
For now, these changes from ScienceDirect will still fix various situations where files are saved within the Zotero app, such as when using Add Item by Identifier.
Upgrade Storage
We did, however, just make major improvements to attachment saving in the beta that were specifically intended to fix this (and similar problems). And they'll still help if ScienceDirect restores these measures in the future.
For now, these changes from ScienceDirect will still fix various situations where files are saved within the Zotero app, such as when using Add Item by Identifier.