group() to bundle multiple messages into one logical unit, such as an album of images or a multi-attachment reply.
Each item is delivered as its own envelope, but the items ship together so the receiving platform can render them as a single visual group when supported.
Content
Groups
Bundle multiple messages into one logical visual group.
Use
Groups don’t nest, and reactions can’t be group members. The builder enforces both at construction time. Platforms that don’t support grouping fall back to sending each item sequentially.