Image Layers Not Displaying Correctly in ArcGIS Online

[MattEvans1]

Hello,

I am currently working on building some web maps of a county-wide hillshade displayed below a transparent slope layer. I want the slope to display with a green to red stretch, and this works when I add the slope by itself to a newly created web map. But if I try to add the hillshade image layer to a map it will not display unless I choose to use it as a basemap. I would be fine using the hillshade as a basemap, but when I do this I lose all symbology functionality with the slope and it defaults to the black to white stretch.

Would I need coordinate systems to match between my added layer and the basemap for them to display correctly? And is there any option for me to tweak symbology settings of the slope layer when I use a custom basemap?

Thanks in advance,

Matt

[MattEvans1]

Now it turns out that my slope layer will display when it is added on the basemap from the U.S. National Grid living atlas layer. I added my hillshade too, but only the slope will display at all.