When you open message and try to delete bulk of attachments nothing happened! You can delete pictures one by one from message conversation but you cannot delete them from message details whereas you can locate images and attachments files! I’m using 11.4 beta 2, iPhone 7+ Anyone face same issue?
There was a mention of someone experiencing this kind of thing at https://forums.macrumors.com/thread...-4-to-developers.2115263/page-3#post-25987367 Might be also better to post your question in the iOS 11.4 beta 2 discussion thread at https://forums.macrumors.com/threads/ios-11-4-beta-2-bug-fixes-changes-and-improvements.2115262/