Slack – Global Feed for Team Including All Channels and Private Messages

Is there a feed in Slack that lists everything that happened in the Slack team in chronological order? (including messages in the channel and private messages)

Here is why I need it: I get a notification in my mobile phone about a team member wrote in a channel. Viewing it on the phone dismisses this notification. When I get back to my desktop, I want to act on that message, but I cannot find that message anymore. I look around in channels, look at the last messages in each channel, try to compare their times, and try to see which one is the latest. This obviously is a difficult situation, especially when I don't remember the contents of the message that I viewed/dismissed on my mobile phone.

If there was a feed in Slack that lists everything that happened in chronological order, I could just look at that and see what happened after what, even when they are in different channels or if they are private messages.

If there is currently a 3rd party integration that does this, please let me know.