diff --git a/CHANGELOG.md b/CHANGELOG.md
index af9b239f..bd62ded4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Backtrace Unity Release Notes
 
-## Version 3.4.0-rc2
+## Version 3.4.0-rc3
 
 - native/managed attachment support - user can add path to attachments via BacktraceClient Initialize method or via Unity Editor in the BacktraceClient's inspector. Once user add them on the initialization method/game object - it will be available in every report that BacktraceClient will send to Backtrace.
 - background thread support - now BacktraceClient will report exceptions/unhandled exceptions generated by any background thread.
diff --git a/Runtime/BacktraceClient.cs b/Runtime/BacktraceClient.cs
index 56036097..fe5e6980 100644
--- a/Runtime/BacktraceClient.cs
+++ b/Runtime/BacktraceClient.cs
@@ -22,7 +22,7 @@ public class BacktraceClient : MonoBehaviour, IBacktraceClient
     {
         public BacktraceConfiguration Configuration;
 
-        public const string VERSION = "3.4.0-rc2";
+        public const string VERSION = "3.4.0-rc3";
         public bool Enabled { get; private set; }
 
         /// <summary>
diff --git a/Runtime/Services/BacktraceApi.cs b/Runtime/Services/BacktraceApi.cs
index 5bac1c8a..b262ab02 100644
--- a/Runtime/Services/BacktraceApi.cs
+++ b/Runtime/Services/BacktraceApi.cs
@@ -18,6 +18,10 @@ namespace Backtrace.Unity.Services
     /// </summary>
     internal class BacktraceApi : IBacktraceApi
     {
+        /// <summary>
+        /// Name reserved file with diagnostic data - JSON diagnostic data/minidump file
+        /// </summary>
+        private const string DiagnosticFileName = "upload_file";
         /// <summary>
         /// User custom request method
         /// </summary>
@@ -114,20 +118,7 @@ public IEnumerator SendMinidump(string minidumpPath, IEnumerable<string> attachm
             {
                 yield break;
             }
-            List<IMultipartFormSection> formData = new List<IMultipartFormSection>
-            {
-                new MultipartFormFileSection("upload_file", minidumpBytes)
-            };
-
-            foreach (var file in attachments)
-            {
-                if (File.Exists(file) && new FileInfo(file).Length < 10000000)
-                {
-                    formData.Add(new MultipartFormFileSection(
-                        string.Format("attachment__{0}", Path.GetFileName(file)),
-                        File.ReadAllBytes(file)));
-                }
-            }
+            var formData = CreateMinidumpFormData(minidumpBytes, attachments);
 
             yield return new WaitForEndOfFrame();
             var boundaryIdBytes = UnityWebRequest.GenerateBoundary();
@@ -221,22 +212,7 @@ public IEnumerator Send(string json, List<string> attachments, Dictionary<string
                 ? GetParametrizedQuery(_serverUrl.ToString(), queryAttributes)
                 : ServerUrl;
 
-
-            List<IMultipartFormSection> formData = new List<IMultipartFormSection>
-            {
-                new MultipartFormFileSection("upload_file",  Encoding.UTF8.GetBytes(json), "upload_file.json", "application/json")
-            };
-
-            foreach (var file in attachments)
-            {
-                if (File.Exists(file) && new FileInfo(file).Length < 10000000)
-                {
-                    formData.Add(new MultipartFormFileSection(
-                        string.Format("attachment__{0}", Path.GetFileName(file)),
-                        File.ReadAllBytes(file)));
-                }
-            }
-
+            var formData = CreateJsonFormData(Encoding.UTF8.GetBytes(json), attachments);
 
             var boundaryIdBytes = UnityWebRequest.GenerateBoundary();
             using (var request = UnityWebRequest.Post(requestUrl, formData, boundaryIdBytes))
@@ -299,6 +275,55 @@ public IEnumerator Send(string json, List<string> attachments, Dictionary<string
             }
         }
 
+        /// <summary>
+        /// Generate JSON form data
+        /// </summary>
+        /// <param name="json">Diagnostic JSON bytes</param>
+        /// <param name="attachments">List of attachments</param>
+        /// <returns>Diagnostic JSON form data</returns>
+        private List<IMultipartFormSection> CreateJsonFormData(byte[] json, IEnumerable<string> attachments)
+        {
+            List<IMultipartFormSection> formData = new List<IMultipartFormSection>
+            {
+                new MultipartFormFileSection(DiagnosticFileName,  json, string.Format("{0}.json",DiagnosticFileName), "application/json")
+            };
+            AddAttachmentToFormData(formData, attachments);
+            return formData;
+        }
+
+        /// <summary>
+        /// Create minidump form data
+        /// </summary>
+        /// <param name="minidump">Minidump bytes</param>
+        /// <param name="attachments">list of attachments</param>
+        /// <returns>Minidump form data</returns>
+        private List<IMultipartFormSection> CreateMinidumpFormData(byte[] minidump, IEnumerable<string> attachments)
+        {
+
+            List<IMultipartFormSection> formData = new List<IMultipartFormSection>
+            {
+                new MultipartFormFileSection(DiagnosticFileName, minidump)
+            };
+            AddAttachmentToFormData(formData, attachments);
+            return formData;
+        }
+
+        private void AddAttachmentToFormData(List<IMultipartFormSection> formData, IEnumerable<string> attachments)
+        {
+            // make sure attachments are not bigger than 10 Mb.
+            const int maximumAttachmentSize = 10000000;
+            const string attachmentPrefix = "attachment_";
+            foreach (var file in attachments)
+            {
+                if (File.Exists(file) && new FileInfo(file).Length < maximumAttachmentSize)
+                {
+                    formData.Add(new MultipartFormFileSection(
+                        string.Format("{0}{1}", attachmentPrefix, Path.GetFileName(file)),
+                        File.ReadAllBytes(file)));
+                }
+            }
+        }
+
         private void PrintLog(UnityWebRequest request)
         {
             if (!_shouldDisplayFailureMessage)
diff --git a/package.json b/package.json
index 48689380..6adc14e5 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "io.backtrace.unity",
   "displayName": "Backtrace",
-  "version": "3.4.0-rc2",
+  "version": "3.4.0-rc3",
   "unity": "2017.1",
   "description": "Backtrace's integration with Unity games allows customers to capture and report handled and unhandled Unity exceptions to their Backtrace instance, instantly offering the ability to prioritize and debug software errors.",
   "keywords": [