Simplest PyTorch code to recreate issue:
import torch

def only_stft():
    return torch.stft(torch.tensor([1.0, 1.0, 1.0]), 4)

stft = torch.jit.script(only_stft)
stft.save("stft.pt")

Then I added this Java snippet inside of HelloWorldApp example code: android-demo-app/HelloWorldApp at master · pytorch/android-demo-app · GitHub 2
    try {
      Module mod = Module.load(assetFilePath(this, "stft.pt"));
      IValue result = mod.forward();
    } catch (IOException e) {
      finish();
    }

The error I get (replaced few personal parts with ...):
Install successfully finished in 4 s 38 ms.
$ adb shell am start -n "org.pytorch.helloworld/org.pytorch.helloworld.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Connected to process 23935 on device '...'.
Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.
W/orch.helloworld: type=1400 audit(0.0:322903): avc: denied { read } for name="u:object_r:vendor_default_prop:s0" dev="tmpfs" ino=11093 scontext=u:r:untrusted_app_27:s0:c10,c257,c512,c768 tcontext=u:object_r:vendor_default_prop:s0 tclass=file permissive=0
E/libc: Access denied finding property "ro.hardware.chipname"
W/native: [W SpectralOps.cpp:639] Warning: stft will soon require the return_complex parameter be given for real inputs, and will further require that return_complex=True in a future PyTorch release. (function operator())
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: org.pytorch.helloworld, PID: 23935
    java.lang.RuntimeException: Unable to start activity ComponentInfo{org.pytorch.helloworld/org.pytorch.helloworld.MainActivity}: java.lang.RuntimeException: The following operation failed in the TorchScript interpreter.
    Traceback of TorchScript, serialized code (most recent call last):
      File "code/__torch__.py", line 7, in forward
      def forward(self: __torch__.PlaceholderModule) -> Tensor:
        _0 = torch.tensor([1., 1., 1.], dtype=None, device=None, requires_grad=False)
        _1 = __torch__.torch.functional.stft(_0, 4, None, None, None, True, "reflect", False, None, None, )
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <--- HERE
        return _1
      File "code/__torch__/torch/functional.py", line 21, in stft
      else:
        input0 = input
      _2 = torch.stft(input0, n_fft, hop_length, win_length, window, normalized, onesided, return_complex)
           ~~~~~~~~~~ <--- HERE
      return _2
    
    Traceback of TorchScript, original code (most recent call last):
      File "C:\Users\...\Anaconda3\envs\...\lib\site-packages\torch\functional.py", line 515, in stft
            input = F.pad(input.view(extended_shape), (pad, pad), pad_mode)
            input = input.view(input.shape[-signal_dim:])
        return _VF.stft(input, n_fft, hop_length, win_length, window,  # type: ignore
               ~~~~~~~~ <--- HERE
                        normalized, onesided, return_complex)
    RuntimeError: fft: ATen not compiled with MKL support
    
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3534)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3689)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:140)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:100)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2239)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:227)
        at android.app.ActivityThread.main(ActivityThread.java:7822)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1026)
     Caused by: java.lang.RuntimeException: The following operation failed in the TorchScript interpreter.
    Traceback of TorchScript, serialized code (most recent call last):
      File "code/__torch__.py", line 7, in forward
      def forward(self: __torch__.PlaceholderModule) -> Tensor:
        _0 = torch.tensor([1., 1., 1.], dtype=None, device=None, requires_grad=False)
        _1 = __torch__.torch.functional.stft(_0, 4, None, None, None, True, "reflect", False, None, None, )
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <--- HERE
        return _1
      File "code/__torch__/torch/functional.py", line 21, in stft
      else:
        input0 = input
      _2 = torch.stft(input0, n_fft, hop_length, win_length, window, normalized, onesided, return_complex)
           ~~~~~~~~~~ <--- HERE
      return _2
    
    Traceback of TorchScript, original code (most recent call last):
      File "C:\Users\...\Anaconda3\envs\...\lib\site-packages\torch\functional.py", line 515, in stft
            input = F.pad(input.view(extended_shape), (pad, pad), pad_mode)
            input = input.view(input.shape[-signal_dim:])
        return _VF.stft(input, n_fft, hop_length, win_length, window,  # type: ignore
               ~~~~~~~~ <--- HERE
                        normalized, onesided, return_complex)
    RuntimeError: fft: ATen not compiled with MKL support
    
        at org.pytorch.NativePeer.forward(Native Method)
        at org.pytorch.Module.forward(Module.java:49)
        at org.pytorch.helloworld.MainActivity.onCreate(MainActivity.java:37)
        at android.app.Activity.performCreate(Activity.java:7963)
        at android.app.Activity.performCreate(Activity.java:7952)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1306)
E/AndroidRuntime:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3505)
        	... 11 more
I/Process: Sending signal. PID: 23935 SIG: 9