diff --git a/arklib/.cargo/config b/arklib/.cargo/config
index 9bb79f04..658222e4 100644
--- a/arklib/.cargo/config
+++ b/arklib/.cargo/config
@@ -1,2 +1,5 @@
 [build]
 target = "aarch64-linux-android"
+#RUSTFLAGS="-C debug-assertions -Zsanitizer=hwaddress -g"
+RUSTFLAGS="-C debuginfo=2"
+RUSTDOCFLAGS="-C -Zsanitizer=address"
\ No newline at end of file
diff --git a/arklib/src/lib.rs b/arklib/src/lib.rs
index 641de9ba..d7c292ab 100644
--- a/arklib/src/lib.rs
+++ b/arklib/src/lib.rs
@@ -295,13 +295,16 @@ pub mod android {
             .get_string(jni_path)
             .expect("failed to parse input file name")
             .into();
-        debug!("Preview PDF Path: {file_path}");
-        let file = File::open(file_path).expect("failed to open file");
+        debug!("Preview PDF 1 Path: {file_path}");
+        let file = File::open(file_path.clone()).expect("failed to open file");
+        debug!("Preview PDF 2 Path: {file_path}");
         let quality: String = env
             .get_string(jni_quality)
             .expect("failed to read quality")
             .into();
 
+        debug!("Preview PDF 3 Path: {file_path}");
+
         let quality = match quality.as_str() {
             "HIGH" => PDFQuality::High,
             "MEDIUM" => PDFQuality::Medium,
@@ -311,8 +314,12 @@ pub mod android {
             }
         };
 
+        debug!("Preview PDF 4 Path: {file_path}");
+
         let image = arklib::pdf::render_preview_page(file, quality);
 
+        debug!("Preview PDF 5 Path: {file_path}");
+
         let bitmap_cls = env.find_class("android/graphics/Bitmap").unwrap();
         let create_bitmap_fn = env
             .get_static_method_id(
@@ -321,6 +328,7 @@ pub mod android {
                 "(IILandroid/graphics/Bitmap$Config;)Landroid/graphics/Bitmap;",
             )
             .unwrap();
+        debug!("Preview PDF 6 Path: {file_path}");
 
         let config_name = env.new_string("ARGB_8888").unwrap();
         let bitmap_config_cls = env.find_class("android/graphics/Bitmap$Config").unwrap();
@@ -331,6 +339,7 @@ pub mod android {
                 "(Ljava/lang/String;)Landroid/graphics/Bitmap$Config;",
             )
             .unwrap();
+        debug!("Preview PDF 7 Path: {file_path}");
 
         let bitmap_config = env
             .call_static_method_unchecked(
@@ -341,6 +350,8 @@ pub mod android {
             )
             .unwrap();
 
+        debug!("Preview PDF 8 Path: {file_path}");
+
         let bitmap = env
             .call_static_method_unchecked(
                 bitmap_cls,
@@ -356,11 +367,15 @@ pub mod android {
             .l()
             .unwrap();
 
+        debug!("Preview PDF 9 Path: {file_path}");
+
         let pixels = env
             .new_int_array((image.width() * image.height()) as jint)
             .unwrap();
         let rgba8img = image.as_rgba8().unwrap();
 
+        debug!("Preview PDF 10 Path: {file_path}");
+
         let mut raw_pixel = vec![];
         for i in 0..((image.width() * image.height()) as usize) {
             let rgba8img = rgba8img.as_bytes();
@@ -375,11 +390,14 @@ pub mod android {
                 | (blue)) as i32;
             raw_pixel.push(current_pixel);
         }
+
+        debug!("Preview PDF 11 Path: {file_path}");
         env.set_int_array_region(pixels, 0, raw_pixel.as_slice())
             .unwrap();
         let set_pixels_fn = env
             .get_method_id(bitmap_cls, "setPixels", "([IIIIIII)V")
             .unwrap();
+        debug!("Preview PDF 12 Path: {file_path}");
 
         env.call_method_unchecked(
             bitmap,
@@ -397,6 +415,8 @@ pub mod android {
         )
         .unwrap();
 
+        debug!("Preview PDF 13 Path: {file_path}");
+
         bitmap.into_inner()
     }
 
diff --git a/build.gradle b/build.gradle
index 603cb597..293d8396 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,6 +5,7 @@ buildscript {
         google()
         maven { url "https://plugins.gradle.org/m2/" }
         gradlePluginPortal()
+        mavenLocal()
     }
     dependencies {
         classpath "org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:4.4.1.3373"
diff --git a/lib/build.gradle b/lib/build.gradle
index 14e2fc1d..a431cca8 100644
--- a/lib/build.gradle
+++ b/lib/build.gradle
@@ -35,6 +35,8 @@ android {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            debuggable true
+            jniDebuggable true
         }
     }
     publishing {
@@ -45,6 +47,8 @@ android {
             withSourcesJar()
         }
     }
+    packagingOptions.doNotStrip "**/*.so"
+
     ndkVersion "25.2.9519653"
     namespace "dev.arkbuilders.arklib"
 }
@@ -58,7 +62,7 @@ cargo {
     prebuiltToolchains = true
     // Set to "debug" to enable logging. Or "release" to make a production build.
     // https://github.com/mozilla/rust-android-gradle/issues/38
-    profile = gradle.startParameter.taskNames.any { it.toLowerCase().contains("debug") } ? "debug" : "release"
+    profile = "debug"/*gradle.startParameter.taskNames.any { it.toLowerCase().contains("debug") } ? "debug" : "release"*/
 }
 
 dependencies {
@@ -93,7 +97,7 @@ tasks.whenTaskAdded { task ->
 
 //For local development:
 //def libVersion = '999'
-def libVersion = scmVersion.version
+def libVersion = /*scmVersion.version*/"0.3.4-snapshot-crash-28"
 
 publishing {
     publications {
diff --git a/lib/src/main/java/dev/arkbuilders/arklib/data/meta/MetadataStorage.kt b/lib/src/main/java/dev/arkbuilders/arklib/data/meta/MetadataStorage.kt
index db4e486d..eea5da8d 100644
--- a/lib/src/main/java/dev/arkbuilders/arklib/data/meta/MetadataStorage.kt
+++ b/lib/src/main/java/dev/arkbuilders/arklib/data/meta/MetadataStorage.kt
@@ -1,5 +1,6 @@
 package dev.arkbuilders.arklib.data.meta
 
+import android.util.Log
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
@@ -14,6 +15,8 @@ internal class MetadataStorage(
 ) : FolderStorage<Metadata>(
     "metadata", scope, path, MonoidIsNotUsed()
 ) {
+
+    private val TAG = "tuancoltech"
     override fun isNeutral(value: Metadata): Boolean = false
 
     override suspend fun valueToBinary(value: Metadata): ByteArray {
@@ -32,9 +35,20 @@ internal class MetadataStorage(
 
     override suspend fun valueFromBinary(raw: ByteArray): Metadata {
         val text = String(raw, Charsets.UTF_8)
+        if (text.isEmpty()) return Metadata.Unknown()
+
+        Log.i(TAG, "valueFromBinary text: " + text)
         val json = Json.parseToJsonElement(text)
 
-        val kind = json.jsonObject[KIND]!!.jsonPrimitive.content
+        Log.d(TAG, "valueFromBinary json: " + json + "\njsonObj: " + json.jsonObject
+                + "\njson.jsonObject[KIND]: " + json.jsonObject[KIND])
+
+//        if (json.jsonObject[KIND] == null) {
+//            Log.w(TAG, "Parsing unknown kind now...")
+//            return Metadata.Unknown()
+//        }
+
+        val kind = json.jsonObject[KIND]?.jsonPrimitive?.content ?: return Metadata.Unknown()
 
         val metadata = when (Kind.valueOf(kind)) {
             Kind.IMAGE ->
diff --git a/lib/src/main/java/dev/arkbuilders/arklib/data/preview/generator/PdfPreviewGenerator.kt b/lib/src/main/java/dev/arkbuilders/arklib/data/preview/generator/PdfPreviewGenerator.kt
index 982c2290..1ce3be85 100644
--- a/lib/src/main/java/dev/arkbuilders/arklib/data/preview/generator/PdfPreviewGenerator.kt
+++ b/lib/src/main/java/dev/arkbuilders/arklib/data/preview/generator/PdfPreviewGenerator.kt
@@ -1,5 +1,6 @@
 package dev.arkbuilders.arklib.data.preview.generator
 
+import android.util.Log
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import dev.arkbuilders.arklib.PreviewQuality
@@ -25,9 +26,11 @@ object PdfPreviewGenerator : PreviewGenerator {
     override suspend fun generate(path: Path, meta: Metadata): Result<Preview> {
         // PDF preview generation must be sequential because Rust pdfium-render isn't thread-safe
         // See https://github.com/ARK-Builders/ARK-Navigator/pull/271
+        Log.d("PdfPreviewGenerator", "START generating preview for path: " + path)
         val bitmap = mutex.withLock {
-            pdfPreviewGenerate(path.toString(), PreviewQuality.MEDIUM)
+            pdfPreviewGenerate(path.toString(), PreviewQuality.LOW)
         }
+        Log.d("PdfPreviewGenerator", "END generating preview for path: " + path)
 
         return Result.success(Preview(bitmap, onlyThumbnail = false))
     }
diff --git a/lib/src/main/java/dev/arkbuilders/arklib/data/storage/FolderStorage.kt b/lib/src/main/java/dev/arkbuilders/arklib/data/storage/FolderStorage.kt
index 6e5e4068..1b455520 100644
--- a/lib/src/main/java/dev/arkbuilders/arklib/data/storage/FolderStorage.kt
+++ b/lib/src/main/java/dev/arkbuilders/arklib/data/storage/FolderStorage.kt
@@ -1,5 +1,6 @@
 package dev.arkbuilders.arklib.data.storage
 
+import android.os.Build
 import android.util.Log
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -12,10 +13,10 @@ import java.nio.file.Path
 import java.nio.file.attribute.FileTime
 import java.time.Instant
 import java.util.concurrent.ConcurrentHashMap
+import java.util.stream.Collectors
 import kotlin.io.path.deleteIfExists
 import kotlin.io.path.isDirectory
 import kotlin.io.path.relativeTo
-import kotlin.streams.toList
 
 abstract class FolderStorage<V>(
     private val label: String,
@@ -78,7 +79,7 @@ abstract class FolderStorage<V>(
         val newTimestamps: ConcurrentHashMap<ResourceId, FileTime> =
             ConcurrentHashMap()
 
-        val jobs = Files.list(storageFolder)
+        val stream = Files.list(storageFolder)
             .filter { !it.isDirectory() }
             .map { path ->
                 Log.v(logPrefix, "reading value from $path")
@@ -101,7 +102,13 @@ abstract class FolderStorage<V>(
                         newTimestamps[id] = newTimestamp
                     }
                 }
-            }.toList()
+            }
+
+        val jobs = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
+            stream.toList()
+        } else {
+            stream.collect(Collectors.toList())
+        }
 
         jobs.joinAll()