diff --git a/project/BuildHelper.scala b/project/BuildHelper.scala
index 904f3fb5..fa578c52 100644
--- a/project/BuildHelper.scala
+++ b/project/BuildHelper.scala
@@ -108,21 +108,6 @@ object BuildHelper {
           "-Xmax-classfile-name",
           "242"
         ) ++ std2xOptions ++ optimizerOptions(optimize)
-      case Some((2, 11)) =>
-        Seq(
-          "-Ypartial-unification",
-          "-Yno-adapted-args",
-          "-Ywarn-inaccessible",
-          "-Ywarn-infer-any",
-          "-Ywarn-nullary-override",
-          "-Ywarn-nullary-unit",
-          "-Xexperimental",
-          "-Ywarn-unused-import",
-          "-Xfuture",
-          "-Xsource:2.13",
-          "-Xmax-classfile-name",
-          "242"
-        ) ++ std2xOptions
       case _             => Seq.empty
     }
 
diff --git a/src/main/scala/zio/s3/Live.scala b/src/main/scala/zio/s3/Live.scala
index dd065fca..2c9601ae 100644
--- a/src/main/scala/zio/s3/Live.scala
+++ b/src/main/scala/zio/s3/Live.scala
@@ -119,12 +119,13 @@ final class Live(unsafeClient: S3AsyncClient) extends S3.Service {
     options: UploadOptions
   ): ZIO[R, S3Exception, Unit] =
     content
-      .mapChunks(Chunk.single)
       .mapError(e => S3Exception.builder().message(e.getMessage).cause(e).build())
       .refineOrDie {
         case e: S3Exception => e
       }
-      .mapM { chunk =>
+      .mapChunks(c => Chunk(ByteBuffer.wrap(c.toArray)))
+      .toPublisher
+      .flatMap { publisher =>
         execute(
           _.putObject(
             {
@@ -139,11 +140,10 @@ final class Live(unsafeClient: S3AsyncClient) extends S3.Service {
                 .fold(builder)(builder.contentType)
                 .build()
             },
-            AsyncRequestBody.fromBytes(chunk.toArray)
+            AsyncRequestBody.fromPublisher(publisher)
           )
         )
       }
-      .runCollect
       .unit
 
   def multipartUpload[R](
diff --git a/src/test/scala/zio/s3/S3Test.scala b/src/test/scala/zio/s3/S3Test.scala
index f8578c7a..433a5918 100644
--- a/src/test/scala/zio/s3/S3Test.scala
+++ b/src/test/scala/zio/s3/S3Test.scala
@@ -57,6 +57,13 @@ object InvalidS3LayerTestSpec extends DefaultRunnableSpec {
 object S3Suite {
   val bucketName = "bucket-1"
 
+  private[this] def randomNEStream(): (Int, ZStream[Any, Nothing, Byte]) = {
+    val size  = PartSize.Min + Random.nextInt(100)
+    val bytes = new Array[Byte](size)
+    Random.nextBytes(bytes)
+    (size, ZStream.fromChunks(Chunk.fromArray(bytes)))
+  }
+
   def spec(label: String, root: ZPath): Spec[S3 with Blocking, TestFailure[Exception], TestSuccess] =
     suite(label)(
       testM("listAllObjects") {
@@ -203,9 +210,9 @@ object S3Suite {
 
       },
       testM("put object") {
-        val c             = Chunk.fromArray("Hello F World".getBytes)
+        val c             = Chunk.fromArray(Random.nextString(65536).getBytes())
         val contentLength = c.length.toLong
-        val data          = ZStream.fromChunks(c)
+        val data          = ZStream.fromChunks(c).chunkN(5)
         val tmpKey        = Random.alphanumeric.take(10).mkString
 
         for {
@@ -242,7 +249,7 @@ object S3Suite {
         } yield assert(contentLength)(isGreaterThan(0L))
       },
       testM("multipart with parrallelism = 1") {
-        val (dataLength, data) = randomNEStream
+        val (dataLength, data) = randomNEStream()
         val tmpKey             = Random.alphanumeric.take(10).mkString
 
         for {
@@ -274,7 +281,7 @@ object S3Suite {
         } yield assert(contentLength)(equalTo(0L))
       },
       testM("multipart object when the content type is not provided") {
-        val (_, data) = randomNEStream
+        val (_, data) = randomNEStream()
         val tmpKey    = Random.alphanumeric.take(10).mkString
 
         for {
@@ -285,7 +292,7 @@ object S3Suite {
       },
       testM("multipart object when there is a content type and metadata") {
         val metadata  = Map("key1" -> "value1")
-        val (_, data) = randomNEStream
+        val (_, data) = randomNEStream()
         val tmpKey    = Random.alphanumeric.take(10).mkString
 
         for {
@@ -302,7 +309,7 @@ object S3Suite {
           assert(objectMetadata.metadata.map { case (k, v) => k.toLowerCase -> v })(equalTo(Map("key1" -> "value1")))
       },
       testM("multipart object when the chunk size and parallelism are customized") {
-        val (dataSize, data) = randomNEStream
+        val (dataSize, data) = randomNEStream()
         val tmpKey           = Random.alphanumeric.take(10).mkString
 
         for {
@@ -324,7 +331,7 @@ object S3Suite {
         } yield assert(succeed)(isFalse)
       },
       testM("put object when the content type is not provided") {
-        val (dataSize, data) = randomNEStream
+        val (dataSize, data) = randomNEStream()
         val tmpKey           = Random.alphanumeric.take(10).mkString
 
         for {
@@ -335,7 +342,7 @@ object S3Suite {
       },
       testM("put object when there is a content type and metadata") {
         val _metadata        = Map("key1" -> "value1")
-        val (dataSize, data) = randomNEStream
+        val (dataSize, data) = randomNEStream()
         val tmpKey           = Random.alphanumeric.take(10).mkString
 
         for {
@@ -352,11 +359,4 @@ object S3Suite {
       }
     )
 
-  //TODO remove and use generator
-  private[this] def randomNEStream = {
-    val size  = PartSize.Min + Random.nextInt(100)
-    val bytes = new Array[Byte](size)
-    Random.nextBytes(bytes)
-    (size, ZStream.fromChunks(Chunk.fromArray(bytes)))
-  }
 }