Migrating outmoded message compositions to blocks | Slack Developer Docs

In early 2019 we introduced a new way of composing messages, by using blocks to create rich and interactive layouts. Slack apps designed and built before then may have used features such as attachments which are now considered outmoded. These older features will continue to work, but apps using them will miss out on the new layout and interactivity features blocks provide. This guide is intended f

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なるほど