After upgrading my custom icons are not picked up

Document ID : KB000110065
Last Modified Date : 08/08/2018
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After upgrading to 17.x I had some offerings with custom icons which are not using the custom icons.
Custom icons need to reside in the proper filestore location.
Custom icons for offering must reside in:
Additionally, if you customize UI icons or other things, this would be under:
There should not be any customizations outside of the filestore folder and the proper folders here.