As I understand it, Marker Line Symbols do not supported in ArcGis Online.
It would been nice to know if there is a way to work around the issue (that does not involve Server).
My symbology in the ArcMap, looks like this:
I wonder if you can convert your marker symbols into graphics and then convert them back into a shapefile. After that you should be able to upload them to AGOL.
This is a very nice idea, but...
I tried it, and the buster still remember it was a line.
Thanks for trying
Consider supporting this idea on the ideas site, ArcGIS Idea - Add Line Decorations to Online or posting a new idea.
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