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I would like to make a reference to an already uploaded javascript and a CSS Style within a Appery.io html control.
So far I am using the syntax as shown in the screen shot.
Is this correct? 
Hello Bernie,
Please add these files to the "User-defined resources" list:
App Settings - Resources - User-defined resources
As far as I can see they are listed under
App Settings - Resources - Internal CSS resources
automatically.
But
link rel="stylesheet" href="files/css/ol-layerswitcher.css"
seems to be the correct path.
Could you clarify, is the issue already solved? Do you need further assistance?
Serhii,
Yes, it's solved.