In the dashboard edit mode, go to the right sidebar and in the “Add passive elements” segment, select Upload and hit Next.
In the next step, select your CSV file, and if you wish, you can add a widget description.
After that, select the widget size, and from the drop down menu, select the “Regular Card” option.
You can also upload a historical CSV or image file, which will be set only for the specific time frame.
NOTE: You can also use markdown for all passive widgets and footers.