I am using ARC PRO 2.6.2 and I can use the Military Symbol Editor to draw my operational overlay graphics. However, when I want to publish to the web for further review/dissemination I am unable to see the 2525D symbols in the web map (only "dots" are rendered for the enemy forces). However, if I share the enemy forces layer as a web layer the proper symbols display but loose the ability to edit in the web map. Can someone shed some light on what I might try/what I may be doing wrong.
If your overlays need to display and support editing in apps built on the 3.x API, then you need to follow the workflow outlined here (Share using ArcGIS Enterprise). This workflow publishes the layer both as a map image service (which can render the military symbology on the 3.x client) and feature service (which allows access to the features and editing from the client). The Map Viewer Classic will let you add both of these layers (map and feature) to the map and will treat them as one unified layer.
If your overlays need will be used in apps built on 4.x API, you can "Share as Web Layer" to publish your layers as a feature service (from your Enterprise GBD, or hosted) from Pro, but you need to first be sure to choose the web style for 2525D in the Dictionary Renderer.
I know there are several nuances in what I've described above, so please feel free to reach out to me directly or in this thread with any questions you might have.