This issue has been resolved. All announcement attachments should open normally on iOS.
May 4, 16:44 PDT
We have made a fix so all new school announcements can be opened in the iOS app. We are now working to clean up previously sent announcements so these announcements can be opened on iOS.
May 4, 12:05 PDT
We have identified an issue where some teachers, students and families will see an “Item Not Found” error when trying to open the expanded post view of school announcements message attachments on iOS devices. This issue is affecting new school announcement attachments with images, videos, links or PDFs. The issue is isolated to iOS, there are no issues on Android or web. We are actively working on a fix.
May 4, 11:35 PDT