Modal · Contextual help
Slack’s confirmation popup window is necessary but fun
Slack double-checks before a file is shared with another workspace, using an illustrated confirmation modal with Edit Message, Send and a don't-ask option.
Screenshot added to the library in March 2023; its exact capture date wasn’t recorded, and the product may look different today. Write-up reviewed 22 Oct 2026.
At the time of the screenshot, Slack showed a confirmation modal when a user was about to share a file with people from another workspace. Over a dimmed conversation, it shows a cartoon pigeon in a postal cap carrying a bag of letters, the question "Is it OK to send this?" and one line naming the workspace the file is going to. Below are a "Don't ask me this again" checkbox and two buttons, Edit Message and Send. This isn't onboarding in the strict sense, but it's a good example of UX that teaches users about a function at the moment they use it.
Why it works
✅ The right UX element: sharing a file outside your workspace is worth a pause, so a modal that takes the user's full attention fits the moment.
✅ Fun illustration: the pigeon keeps the check on-brand and light, and it's distinctive enough that users are less likely to click through without reading.
✅ Good options: Edit Message gives a way back, and "Don't ask me this again" lets regular users turn the check off. That option is common in onboarding elements, and it works here too.
More on this pattern: UI modals and building user trust.
