Kelly,
Sorry for the delay, hopefully you have not given up on me. new to this forum and i didn't notice anyone had replied.
Here is my workflow.
In the featureLayer, click on the Service URL of one of the layers.
replace ../rest/services/... with .../rest/admin/services/...
At the bottom, click Update Definition
Here, I replace the part after "drawingInfo":{"Renderer":("type":"simple","symbol":
with the symbol I copied from another featurelayer.
Howerver, for testing sake, I also just tried changing the Height and Width of the existing text from 9 to 29.
I leave the Asynch option to False and Format to HTML
Then I click the Update Layer Definition Button.
I get an error saying:
Invalid definition for 'LastEditDate'.
Invalid definition for ESRI.ArcGIS.SDS.Metadata.EditingInfo
If I change the Asynch Option to True and click the Update Button it looks like it works,
but if i go back to the Visualization tab on the feature layer, it says I need to save my changes, I do, but it doesn't appear anything has changed.