Custom symbol does not appear on map in Arc GIS Portal

[KamranHaider]

I have built a web application in Arc GIS portal. I want to use custom symbol in web map but these symbols does not appear in Map. When I import them in web map the existing default map symbol disappear and customize symbol only appear in map legend. 

I have used png. file format and less than 120 * 120 pixel resolution

[TKSHEP]

I am having the same issue where you able to get this resolved and if so how did you fix it?