In the know and Up on

Up on and in the know are semantically related in aware topic. In some cases you can use "Up on" instead an adjective phrase "In the know", when it comes to topics like cognizant, familiar, clever, experienced.

Up on adjective - Being up to particular standard or level especially in being up to date in knowledge.

In the know and up on are semantically related in aware topic. Sometimes you can use "In the know" instead an adjective "Up on", if it concerns topics such as cognizant, familiar, clever, experienced.