How large is the KML in file size? How many features are in the KML?
There are some limitations listed at this page:
KML—ArcGIS Online Help | ArcGIS
Limitations
Below are the current limitations of using KML layers in the map viewer. - The following elements do not display in a map: regionated KML, view-based and time-based refresh parameters, regions inside network links, and screen overlays.
- Ground overlays and network links without refresh properties do not print.
- Image overlays that cover large areas may appear distorted.
- By default, there is a 30-minute cache delay in displaying updates to the KML layer. If the layer contains refresh parameters less than 30 minutes, the shorter interval is honored. If a refresh interval is set on the layer, the refresh interval is honored.
- KML layers cannot be used as a basemap.
- You cannot set the visibility range for KML layers.
- KML layers cannot be reordered in the map contents.
- Internal KML layers are not supported.
- Configuring pop-ups aren't supported in KML layers. Any feature data in the layer is automatically displayed in pop-ups; you cannot configure or disable them.
- KML layers larger than 10 MB cannot be added to maps.
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