diff --git a/src/main/java/eu/siacs/conversations/entities/Transferable.java b/src/main/java/eu/siacs/conversations/entities/Transferable.java
index 6a31a368a..5c833f603 100644
--- a/src/main/java/eu/siacs/conversations/entities/Transferable.java
+++ b/src/main/java/eu/siacs/conversations/entities/Transferable.java
@@ -22,7 +22,7 @@ public interface Transferable {
 
 	int getStatus();
 
-	long getFileSize();
+	Long getFileSize();
 
 	int getProgress();
 
diff --git a/src/main/java/eu/siacs/conversations/entities/TransferablePlaceholder.java b/src/main/java/eu/siacs/conversations/entities/TransferablePlaceholder.java
index c8a60d7d9..fd72a28a0 100644
--- a/src/main/java/eu/siacs/conversations/entities/TransferablePlaceholder.java
+++ b/src/main/java/eu/siacs/conversations/entities/TransferablePlaceholder.java
@@ -18,8 +18,8 @@ public class TransferablePlaceholder implements Transferable {
 	}
 
 	@Override
-	public long getFileSize() {
-		return 0;
+	public Long getFileSize() {
+		return null;
 	}
 
 	@Override
diff --git a/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java b/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java
index fca5cc705..349886115 100644
--- a/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java
+++ b/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java
@@ -107,6 +107,7 @@ public class HttpDownloadConnection implements Transferable {
             }
             //TODO add auth tag size to knownFileSize
             final Long knownFileSize = message.getFileParams().size;
+            Log.d(Config.LOGTAG,"knownFileSize: "+knownFileSize+", body="+message.getBody());
             if (knownFileSize != null && interactive) {
                 this.file.setExpectedSize(knownFileSize);
                 download(true);
@@ -130,6 +131,7 @@ public class HttpDownloadConnection implements Transferable {
     }
 
     private void download(final boolean interactive) {
+        Log.d(Config.LOGTAG,"download()",new Exception());
         EXECUTOR.execute(new FileDownloader(interactive));
     }
 
@@ -234,11 +236,11 @@ public class HttpDownloadConnection implements Transferable {
     }
 
     @Override
-    public long getFileSize() {
+    public Long getFileSize() {
         if (this.file != null) {
             return this.file.getExpectedSize();
         } else {
-            return 0;
+            return null;
         }
     }
 
diff --git a/src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java b/src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java
index 6611aab2b..f1bae9956 100644
--- a/src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java
+++ b/src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java
@@ -69,8 +69,8 @@ public class HttpUploadConnection implements Transferable, AbstractConnectionMan
     }
 
     @Override
-    public long getFileSize() {
-        return file == null ? 0 : file.getExpectedSize();
+    public Long getFileSize() {
+        return file == null ? null : file.getExpectedSize();
     }
 
     @Override
diff --git a/src/main/java/eu/siacs/conversations/services/AbstractConnectionManager.java b/src/main/java/eu/siacs/conversations/services/AbstractConnectionManager.java
index 40e381816..94c6b79b9 100644
--- a/src/main/java/eu/siacs/conversations/services/AbstractConnectionManager.java
+++ b/src/main/java/eu/siacs/conversations/services/AbstractConnectionManager.java
@@ -5,6 +5,8 @@ import android.os.PowerManager;
 import android.os.SystemClock;
 import android.util.Log;
 
+import androidx.core.content.ContextCompat;
+
 import org.bouncycastle.crypto.engines.AESEngine;
 import org.bouncycastle.crypto.io.CipherInputStream;
 import org.bouncycastle.crypto.io.CipherOutputStream;
@@ -118,7 +120,8 @@ public class AbstractConnectionManager {
     }
 
     public long getAutoAcceptFileSize() {
-        return this.mXmppConnectionService.getLongPreference("auto_accept_file_size", R.integer.auto_accept_filesize);
+        final long autoAcceptFileSize = this.mXmppConnectionService.getLongPreference("auto_accept_file_size", R.integer.auto_accept_filesize);
+        return autoAcceptFileSize <= 0 ? -1 : autoAcceptFileSize;
     }
 
     public boolean hasStoragePermission() {
@@ -134,12 +137,8 @@ public class AbstractConnectionManager {
         }
     }
 
-    public PowerManager.WakeLock createWakeLock(final Thread thread) {
-        return createWakeLock("conversations:" + thread.getName());
-    }
-
     public PowerManager.WakeLock createWakeLock(final String name) {
-        final PowerManager powerManager = (PowerManager) mXmppConnectionService.getSystemService(Context.POWER_SERVICE);
+        final PowerManager powerManager = ContextCompat.getSystemService(mXmppConnectionService, PowerManager.class);
         return powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, name);
     }
 
diff --git a/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleFileTransferConnection.java b/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleFileTransferConnection.java
index 8997a5043..40edf0b2c 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleFileTransferConnection.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleFileTransferConnection.java
@@ -1239,11 +1239,11 @@ public class JingleFileTransferConnection extends AbstractJingleConnection imple
     }
 
     @Override
-    public long getFileSize() {
+    public Long getFileSize() {
         if (this.file != null) {
             return this.file.getExpectedSize();
         } else {
-            return 0;
+            return null;
         }
     }