diff --git a/StudioClient/Photo.cs b/StudioClient/Photo.cs
index 3e1172d..b30602e 100644
--- a/StudioClient/Photo.cs
+++ b/StudioClient/Photo.cs
@@ -120,7 +120,7 @@ private async Task<dynamic> UploadPhoto(string photoPath, string modelName, long
             byte[] md5Hash = md5.ComputeHash(photoData);
             string md5Base64 = Convert.ToBase64String(md5Hash);
 
-            dynamic uploadObj = await GetUploadUrl(photo.id.Value, md5Base64);
+            dynamic uploadObj = await GetUploadUrl(photo.id.Value, System.Net.WebUtility.UrlEncode(md5Base64));
             string presignedUrl = uploadObj.url.Value;
 
             using (RestClient httpClient = new RestClient())
@@ -129,7 +129,8 @@ private async Task<dynamic> UploadPhoto(string photoPath, string modelName, long
                 RestRequest request = new RestRequest(presignedUrl, Method.Put);
 
                 request.AddParameter("application/octet-stream", fileBytes, ParameterType.RequestBody);
-                request.AddHeader("Content-MD5", Convert.ToBase64String(MD5.Create().ComputeHash(fileBytes)));
+                request.AddHeader("Content-MD5", Convert.ToBase64String(md5.ComputeHash(fileBytes)));
+
                 if (modelName == "job") request.AddHeader("X-Amz-Tagging", "job=photo&api=true");
 
                 // Upload image via PUT request to presigned url