diff --git a/src/Transformers/AssetsTransformer.php b/src/Transformers/AssetsTransformer.php
index 98c4ced..26aea69 100644
--- a/src/Transformers/AssetsTransformer.php
+++ b/src/Transformers/AssetsTransformer.php
@@ -99,7 +99,7 @@ private function assetPath(AssetContainerContract $assetContainer, string $path)
 
     private function processAssetUsingSourcePreset($asset, string $path, string $contents): void
     {
-        Storage::disk('local')->put($tempPath = 'statamic/temp-assets/'.uniqid().'.'.Str::afterLast($path, '.'), $contents);
+        Storage::disk('local')->put($tempPath = 'statamic/temp-assets/'.Str::random().'.'.Str::afterLast($path, '.'), $contents);
 
         $uploadedFile = new UploadedFile(
             path: Storage::disk('local')->path($tempPath),
diff --git a/tests/Transformers/AssetsTransformerTest.php b/tests/Transformers/AssetsTransformerTest.php
index d8e5cb1..c8239fe 100644
--- a/tests/Transformers/AssetsTransformerTest.php
+++ b/tests/Transformers/AssetsTransformerTest.php
@@ -3,14 +3,18 @@
 namespace Statamic\Importer\Tests\Transformers;
 
 use Illuminate\Http\UploadedFile;
+use Illuminate\Support\Facades\File;
 use Illuminate\Support\Facades\Http;
 use Illuminate\Support\Facades\Storage;
+use Mockery;
 use PHPUnit\Framework\Attributes\Test;
 use Statamic\Facades\AssetContainer;
 use Statamic\Facades\Collection;
+use Statamic\Facades\Glide;
 use Statamic\Importer\Facades\Import;
 use Statamic\Importer\Tests\TestCase;
 use Statamic\Importer\Transformers\AssetsTransformer;
+use Statamic\Support\Str;
 use Statamic\Testing\Concerns\PreventsSavingStacheItemsToDisk;
 
 class AssetsTransformerTest extends TestCase
@@ -32,7 +36,7 @@ protected function setUp(): void
         $this->collection = tap(Collection::make('pages'))->save();
 
         $this->blueprint = $this->collection->entryBlueprint();
-        $this->blueprint->ensureField('featured_image', ['type' => 'assets', 'max_files' => 1])->save();
+        $this->blueprint->ensureField('featured_image', ['type' => 'assets', 'container' => 'assets', 'max_files' => 1])->save();
 
         $this->field = $this->blueprint->field('featured_image');
 
@@ -228,4 +232,42 @@ public function it_sets_alt_text_on_downloaded_asset()
         $asset = $this->assetContainer->asset('2024/10/image.png');
         $this->assertEquals('A photo taken by someone.', $asset->get('alt'));
     }
+
+    #[Test]
+    public function it_processes_asset_using_source_preset()
+    {
+        Http::fake([
+            'https://example.com/wp-content/uploads/2024/10/image.png' => Http::response(UploadedFile::fake()->image('image.png')->size(100)->get()),
+        ]);
+
+        Str::createRandomStringsUsing(fn () => 'temp');
+
+        File::ensureDirectoryExists(storage_path('statamic/glide/tmp'));
+        File::put(storage_path('statamic/glide/tmp/temp.png/random/temp.png'), 'Transformed Image');
+
+        Glide::shouldReceive('server')->once()->andReturnSelf();
+        Glide::shouldReceive('makeImage')->once()->with('temp.png', ['p' => 'thumbnail'])->andReturn('temp.png/random/temp.png');
+
+        $this->assetContainer->disk('public')->sourcePreset('thumbnail')->save();
+
+        $transformer = new AssetsTransformer(
+            import: $this->import,
+            blueprint: $this->blueprint,
+            field: $this->field,
+            config: [
+                'related_field' => 'url',
+                'base_url' => 'https://example.com/wp-content/uploads',
+                'download_when_missing' => true,
+                'process_downloaded_images' => true,
+            ],
+        );
+
+        $output = $transformer->transform('https://example.com/wp-content/uploads/2024/10/image.png');
+
+        $this->assertEquals('2024/10/image.png', $output);
+
+        Storage::disk('public')->assertExists('2024/10/image.png');
+
+        $this->assertFileDoesNotExist(storage_path('statamic/glide/tmp/temp.png/random/temp.png'));
+    }
 }