Raster Published as Tile Layer Not Displaying on AGOL

I have a raster layer given to me by a colleague. I was able to successfully publish and view it on ArcGIS Online as a tile layer, but now I’m trying to resample it to reduce the size and am starting to see some weird behavior – not only am I not able to successfully view a resampled version, I’m unable to re-publish the original tile layer. Here’s the information I’ve collected so far:

1. The original layer shows up correctly when I add it as a weblayer set to cache on the server.

   It shows up in a gray box when I look at the tile layer or the service definition on ArcGIS Online.

   It’s 43 MB as a tile layer, 102 MB as a service definition. Its visible range was set by default to state-metropolitan area

2. When I use the resample tool to resize the raster pixel size from 30m to 50m and then publish as a web layer, it publishes without errors but does not show up when I view it with MapViewer (new or classic).

   It does not show up in a gray box when I look at the tile layer or the service definition on ArcGIS Online.

   It’s 6MB. Its visible range is set by default to state-metropolitan area.

3. When I re-upload the original layer, it also publishes without errors but does not show up correctly when I view it with MapViewer.

   It does not show up in a gray box when I look at the tile layer or the service definition.

   It’s the same size as the original as a service definition, 102 MB. It’s only 21 MB as a tile layer.