Critical stands out in red and defaults to acknowledgment required.
Everyone
By role
Specific people
By location
0 means they can keep dismissing, but it returns each login until acknowledged. Any number forces acknowledgment after that many dismisses.
A forty second screen capture beats four paragraphs nobody reads at 7am. Clips can be up to 500 MB each; mp4 or mov play best. They upload when you press Send, and a big one takes a few minutes.
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Your title appears here
Your message preview shows here as the reader will see it on login.
This is exactly what recipients see on login. They cannot continue until they dismiss or acknowledge.