Improve explanations

src/Shared.CharaStudio/Studio/UI/Toolbars/CustomToolbarButtons.cs

@@ -23,6 +23,7 @@ public static class CustomToolbarButtons
         /// A 32x32 icon used for the button.
         /// You can find a template here
         /// https://github.com/IllusionMods/IllusionModdingAPI/blob/master/doc/studio%20icon%20template.png
+        /// For best performance and smallest size save your thumbnail as 8bit grayscale png (or indexed if you need colors) with no alpha channel.
         /// </param>
         /// <param name="initialValue">Initial state of the toggle.</param>
         /// <param name="onValueChanged">

src/Shared.Core/Utilities/ResourceUtils.cs

@@ -55,7 +55,7 @@ public static byte[] GetEmbeddedResource(string resourceFileName, Assembly conta
                 if (origAssembly != containingAssembly)
                 {
                     resourceNames = containingAssembly.GetManifestResourceNames().Where(str => str.EndsWith(resourceFileName)).Take(2).ToList();
-                    if (resourceNames.Count == 0) throw new IOException($"Could not find resource with name {resourceNames} inside assembly {containingAssembly} or {origAssembly} - make sure the name and assembly are correct. Two assemblies were checked likely because your method has been harmony patched");
+                    if (resourceNames.Count == 0) throw new IOException($"Could not find resource with name {resourceFileName} inside assembly {containingAssembly} or {origAssembly} - make sure the name and assembly are correct. Two assemblies were checked likely because your method has been harmony patched");
                 }
             }