Follow these steps to enable slack in the Media Manager.
1: Click on the tab labeled SETTINGS in the lefthand menu.
2: In the highlighted section below, add your Slack Web Hook URL.
Click on SAVE CHANGES. Slack is now enabled.
3: To connect a folder to Slack, navigate to the ASSETS tab and click on the gear symbol of the desired folder.
4: In the highlighted section, type in the slack channel or user. Click SAVE SETTINGS.
The folder is now connected.