Script works in python window but not as a tool.

[SeanConway2]

Hello,

I'm trying to run a super simple script to change the band setup of all TIFs loaded in my map.  Runs fine if I paste the code in the python window, but when I add the script to a toolbox and run it, it looks like it's working...I see a lock icon appear next to each TIF, but when it unlocks nothing has updated and it says the geoprocessing tool has successfully run.

Also, is there a way programmatically in python to change just the band setup without having to apply a layer?

import arcpy

p = arcpy.mp.ArcGISProject('CURRENT')
m = p.listMaps('Map')[0]
tifs = m.listLayers('*.tif')
sourceLayer = 'C:/source.lyrx'
for tif in tifs:
     arcpy.ApplySymbologyFromLayer_management(tif,sourceLayer)

Thanks for any help!

[ABishop]

Hello Sean,

Instead of running the geoprocessing tool against your project, I would point to the actual TIFs and then close the project.  They may be getting locked and unable to update due to being accessed in your project.