The order of layers in your map and the visibility of layers are maintained when sharing your web map. The web map also opens with the same extent in which it was published. For all operational layers, you can set the transparency and scale ranges at which the layer should draw, giving you control over what the map user sees as they move between map scales in your web map.
Web maps don't support group layers. If your map has group layers in ArcGIS Pro, all sublayers are shared in the web map as individual layers. Scale ranges that were defined on the group layer are applied to the former sublayers of the group layer.
Depending on the template selected when sharing your web map, ArcGIS Pro tries to share your data as the best web layer type possible. If your data is not supported by the default web layer type, it is shared as the next best layer type.
Web feature layers
Web feature layers support feature querying, visualization, and editing. Many of the properties configured and authored in ArcGIS Pro are maintained when you share your map, including symbology, labeling, pop-ups, time, and feature templates. Configuring these parameters before sharing ensures your web map has the same experience you designed in ArcGIS Pro.
Symbology
If a layer's symbology is only supported for display in ArcGIS Pro, such as pie charts imported from an .mxd file, an error is displayed when the map is analyzed to remove the layer or change the symbology.
With ArcGIS Pro, you can create a wide range of complex and sophisticated symbols. For example, if you use a dashed line to represent a railroad, the symbol will be downgraded to a simple solid line because very complex symbology is not fully supported in a web map. If this applies to one of your symbols in a layer, you see a warning that symbols will be downgraded. You can then decide if you want to replace your symbol in ArcGIS Pro before sharing, or you can use the automatically downgraded symbol.
Note:
In some cases, such as when using unclassed proportional symbology without a unit, the features draw differently in Map Viewer than in ArcGIS Pro. If you are unable to modify the symbology, share this content as a web tile layer to preserve the symbology.Web tile layers
Web tile layers support fast map visualization using a collection of predrawn map images or tiles. For example, you might include tiles of streets in your neighborhood to provide a visual reference for the street signs in your feature layer. Certain layer types, such as raster layers, are shared as web tile layers automatically since that is their inherent format. By drawing from a cache, you can improve the performance of the web tile layer and therefore your web map.
When tile layers are shared, you can choose to build the tiles automatically on the server, manually on the server, or locally. Depending on which option you choose, the tile layer may not immediately be available to view in the web map.
Map image layers
Available when sharing to ArcGIS Enterprise, map image layers can be either dynamic or cached and support both map visualization and feature querying. Unlike web feature layers, map image layers support almost all of the symbology options available when authoring content in ArcGIS Pro. They also support referencing registered data, which means updates to your source data are automatically displayed in the map image layer.