Embeded Dashboard Filters one Attribute at a Time

[csink01]

I have a dashboard summarizing a hexagon grid where each cell has has a list of species that live in that area. I want to embed this dashboard inside an experience builder builder so that users can upload their own shapefile, and when they select a group of hexagons on the map widget of the exb, it will filter the information in the dashboard. I set the ID of the hexagons as the filter {GRID_ID}. However, when I select a group of hexagons on the ExB, it only shows information for one single hexagon, and not summarized information for the group in the dashboard. Is this a limitation where only one feature can be selected at a time, or am I missing something in the url parameters or within the embed widget?