I'm trying to generate a custom map on Google's MyMaps using a KML file exported from R. I'm expecting a chloropleth map - a series of polygons with their colour based on a variable.

I've pasted a simplified structure of the KML file below - there are actually 98 polygons in the actual file, each with their own `Style id`.

My question is why, when I import this file as a layer in MyMaps, the colour of the polygons are all shown as black? I would've thought that, since they all have a `PolyStyle' tag with a 'color' value, that they should all be displayed with separate colours.
I've tried clearing the cache for MyMaps but that hasn't seemed to do anything.

```
<kml xmlns:xsd="https://schemas.opengis.net/kml/2.2.0/ogckml22.xsd" xmlns:xmlns="https://www.opengis.net/kml/2.2/" version="1.0">
  <Document>
    <name>map_test2_1</name>
    <open>1</open>
    <Folder>
      <name>sfdata.frame</name>
      <Style id="poly1">
        <PolyStyle>
          <color>#ff445eb5</color>
          <outline>1</outline>
          <fill>1</fill>
        </PolyStyle>
        <BalloonStyle>
          <text>$[description]</text>
        </BalloonStyle>
      </Style>
     <Placemark>
        <name>School Lane/Tankerton Road Area</name>
        <styleUrl>#poly1</styleUrl>
        <Polygon>
          <extrude>1</extrude>
          <tessellate>0</tessellate>
          <altitudeMode>clampToGround</altitudeMode>
          <outerBoundaryIs>
            <LinearRing>
              <coordinates>-0.3060805,51.402915,0
 -0.2748381,51.3823493,0
 -0.2552687,51.4096612,0
 -0.3060805,51.402915,0</coordinates>
            </LinearRing>
          </outerBoundaryIs>
        </Polygon>
      </Placemark>
  </Folder>
  </Document>
</kml>

```