Actions are special messages that don't adhere to the normal message types that you see for the rest of the features in this section. There are only a handful of these messages:
Action: Checkin - Initial checkin messages and key exchanges
Action: get_tasking - Getting tasking
Action: post_response - Sending tasking responses
Inside of this is where the features listed throughout this section appear
Action: upload - Uploading files from Mythic to the agent
This is a special case. Downloading files from agent to Mythic happen within the post_response messages, but moving files from Mythic to agent happens with the upload action
Action: delegate - No other purpose than to shuttle delegate messages if the agent sending this message isn't doing any other action.