Canvas - Time Filter has no Data Source?

I cant find any info on how to add a data source to the canvas time filter? It just appears to be a static image

Why would you add a datasource to a time filter ? (i.e. what are you trying to achieve)

It's purpose is to apply a filter to a time column (by default @timestamp, but could be another column). Since it is a time filter, the values come from what the widget shows. Doc is here :

dropdownControl, on the other side, is a more generic filter that takes a datasource as input for the values that can be selected :