Hello,
Here are the settings I needed to use to get Slack working with SSL Decrypt:
Protect > Web > Exceptions
[A-Za-z0-9.-]*\.slack-msgs\.com
[A-Za-z0-9.-]*\.slack-edge\.com
files\.slack\.com
The only box that I have checked is to disable HTTPS Decryption.
I'm unsure if files\.slack\.com is necessary but I added it anyway. The other two are definitely needed as the slack troubleshooting page couldn't complete all tests without them.
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