DllNotFoundException: File is present

Where all does Unity search for its dll files? Will it find them if they are located in a package outside the project? Can the Unity editor use .aar files?

I imported an XR plugin, QIYU XR Plugin v1.2.1 (com.uniy.xr.qiyu). When calling their playerprefs wrapper functions I get a DllNotFound Exception directed at the code below. Technically the file is an Android .aar library file, which Unity supports. I don't expect the Unity editor to run Android code, but what should I make of this error? The file is clearly present. Is this error a red herring, such that the .aar file can be found, but a deeper dependency can't-- producing this surface level error?

 DllNotFoundException: qiyivrsdkcore

(1) The package is located in a folder outside of the project. It was imported via Unity Package Manager.

(2) I can search for the file in the project view and see it is located here:

 Packages/QIYU XR Plugin/Runtime/Android/qiyivrsdkcore

(3) I have tried selecting "Any Platform" and leaving it on only "Android"

(4) This issue occurs in editor and in builds with their Quest-like headset.

(5) Dependency Walker does not support .aar files.

(6) Sample of the relevant class.

 namespace Unity.XR.Qiyu
 {
     public static partial class QiyuPlugin
     {
         public class QiyuSDKCorePlugins
         {
             private const string pluginName = "qiyivrsdkcore";
             //------------------------------------------------------------------------    
             [DllImport(pluginName, CallingConvention = CallingConvention.Cdecl)]
             public static extern void QVR_Update(float deltaTime);
             
             (...)
         }
     }
 }