Attachments from inbound emails replying to cases do not appear in new activity stream if they were already present in the target recordIssue Images are not getting attached when answering to cases by email if they already exist in that ticket. Business requirements might request to add all incoming attachments no matter if they are duplicated on the target record.ResolutionThis is an expected out of the box feature. In addition to the file name, each attachment has a hash key that will still evaluate the attachment as a duplicate.Related LinksEmail image filtering properties Inbound email embedded images are being added as attachments to the target record Inbound emails with attached icons / logos / signatures images add duplicate repeated attachments in Activity Stream of target record