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I'm not really sure I follow. What does the WhatsApp has which is missing in Slack?

You can answer and the original post is shown below your answer. You can do the same with Slack by sharing the post, but other solutions make it way simpler, basically just one click.

this sounds dumb, but it's most likely due to patents [0]. in fact whenever you find really simple behavior missing from an app from a large organization you should first assume IP litigation played a role

[0] https://patents.google.com/patent/US9219704B2/en

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