In a personal, team, or group feed, select, "Share a post"

Type your message and add photos, videos, files, or a poll.

Select Next.

Choose the feed(s) you would like to post to.

Select Post.

In the bottom tray, tap Teams/Groups.

In a personal, team, or group feed, select, "Share a post"

Type your message and add photos, videos, files, or a poll.

In the top right, tap Next.

Select additional teams or groups. In the top right, tap Post.