How to show two data sources on a timeline?

[majorkooms]

Dear LS gang, please help!

I have a data blend. Let's say I have FB and Instagram data being pulled in via two different connectors.

Now I want a single timeline chart that show three lines: FB impressions, Insta impressions, and total impressions.

I have set this up, but the timeline demands I choose a date dimension. I can only select either FB date or Insta date. When I choose FB data, I can only see FB data on the timeline, and vice-versa.

How do I achieve the goal?

Thanks a million, in advance.