diff --git a/app/Http/Controllers/Apis/Protected/Summit/OAuth2PresentationApiController.php b/app/Http/Controllers/Apis/Protected/Summit/OAuth2PresentationApiController.php
index fefae881..e46869bb 100644
--- a/app/Http/Controllers/Apis/Protected/Summit/OAuth2PresentationApiController.php
+++ b/app/Http/Controllers/Apis/Protected/Summit/OAuth2PresentationApiController.php
@@ -28,6 +28,7 @@ use Exception;
 use models\utils\IEntity;
 use ModelSerializers\SerializerRegistry;
 use services\model\IPresentationService;
+use utils\ParseMultiPartFormDataInputStream;
 
 /**
  * Class OAuth2PresentationApiController
@@ -675,7 +676,24 @@ final class OAuth2PresentationApiController extends OAuth2ProtectedController
             $summit = SummitFinderStrategyFactory::build($this->summit_repository, $this->resource_server_context)->find($summit_id);
             if (is_null($summit)) return $this->error404();
 
-            $data  = $request->all();
+
+            $content_type = $request->headers->has('Content-Type')  ? strtolower( $request->headers->get('Content-Type')) : null;
+
+            if (false !== $pos = strpos($content_type, ';')) {
+                $content_type = substr($content_type, 0, $pos);
+            }
+
+            if(!strstr($content_type, 'multipart/form-data'))
+                return $this->error400();
+
+            $parser   = new ParseMultiPartFormDataInputStream(file_get_contents('php://input'));
+            $input    = $parser->getInput();
+            $data = $input['parameters'];
+            $files    = $input['files'];
+            $file     = null;
+
+            if(isset($files['file']))
+                $file = $files['file'];
 
             $rules = [
                 'link'            => 'nullable|url',
@@ -700,7 +718,10 @@ final class OAuth2PresentationApiController extends OAuth2ProtectedController
                 'description',
             ];
 
-            $slide = $this->presentation_service->updateSlide($request, $presentation_id, $slide_id, HTMLCleaner::cleanData($data, $fields));
+            $slide = $this->presentation_service->updateSlide
+            (
+                $request, $presentation_id, $slide_id, HTMLCleaner::cleanData($data, $fields), $file
+            );
 
             return $this->updated(SerializerRegistry::getInstance()->getSerializer($slide)->serialize());
         }
diff --git a/app/Services/Model/IPresentationService.php b/app/Services/Model/IPresentationService.php
index 4b4957e7..fbd635dc 100644
--- a/app/Services/Model/IPresentationService.php
+++ b/app/Services/Model/IPresentationService.php
@@ -21,6 +21,7 @@ use models\summit\PresentationSlide;
 use models\summit\PresentationVideo;
 use models\summit\Summit;
 use Illuminate\Http\Request as LaravelRequest;
+use Illuminate\Http\UploadedFile;
 /**
  * Interface IPresentationService
  * @package services\model
@@ -115,6 +116,7 @@ interface IPresentationService
      * @param int $presentation_id
      * @param int $slide_id
      * @param array $slide_data
+     * @param UploadedFile $file
      * @param array $allowed_extensions
      * @param int $max_file_size
      * @return mixed|PresentationSlide
@@ -126,6 +128,7 @@ interface IPresentationService
         $presentation_id,
         $slide_id,
         array $slide_data,
+        UploadedFile $file = null,
         array $allowed_extensions = ['ppt', 'pptx', 'xps',  'key', 'pdf', 'jpg', 'jpeg', 'png', 'svg', 'bmp', 'tga', 'tiff', 'gif'],
         $max_file_size = 10485760
     );
diff --git a/app/Services/Model/PresentationService.php b/app/Services/Model/PresentationService.php
index 8f0052f8..1c4c2e34 100644
--- a/app/Services/Model/PresentationService.php
+++ b/app/Services/Model/PresentationService.php
@@ -38,6 +38,7 @@ use libs\utils\ITransactionService;
 use models\summit\Summit;
 use Illuminate\Http\Request as LaravelRequest;
 use App\Services\Model\IFolderService;
+use Illuminate\Http\UploadedFile;
 /**
  * Class PresentationService
  * @package services\model
@@ -642,7 +643,7 @@ final class PresentationService
             if (!$presentation instanceof Presentation)
                 throw new EntityNotFoundException('presentation not found!');
 
-            $hasLink = isset($slide_data['link']);
+            $hasLink = isset($slide_data['link']) && !empty($slide_data['link']);
             $hasFile = $request->hasFile('file');
 
             if($hasFile && $hasLink){
@@ -683,11 +684,11 @@ final class PresentationService
      * @param int $presentation_id
      * @param int $slide_id
      * @param array $slide_data
+     * @param UploadedFile $file
      * @param array $allowed_extensions
      * @param int $max_file_size
      * @return mixed|PresentationSlide
-     * @throws EntityNotFoundException
-     * @throws ValidationException
+     * @throws \Exception
      */
     public function updateSlide
     (
@@ -695,9 +696,11 @@ final class PresentationService
         $presentation_id,
         $slide_id,
         array $slide_data,
+        UploadedFile $file = null,
         array $allowed_extensions = ['ppt', 'pptx', 'xps',  'key', 'pdf', 'jpg', 'jpeg', 'png', 'svg', 'bmp', 'tga', 'tiff', 'gif'],
         $max_file_size = 10485760
     ){
+
         $slide = $this->tx_service->transaction(function () use
         (
             $request,
@@ -705,7 +708,8 @@ final class PresentationService
             $slide_data,
             $max_file_size,
             $allowed_extensions,
-            $slide_id
+            $slide_id,
+            $file
         ) {
 
             $presentation = $this->presentation_repository->getById($presentation_id);
@@ -724,8 +728,9 @@ final class PresentationService
             if (!$slide instanceof PresentationSlide)
                 throw new EntityNotFoundException('slide not found!');
 
-            $hasLink = isset($slide_data['link']);
-            $hasFile = $request->hasFile('file');
+
+            $hasLink = isset($slide_data['link']) && !empty($slide_data['link']);
+            $hasFile = !is_null($file);
 
             if($hasFile && $hasLink){
                 throw new ValidationException("you must provide a file or a link, not both.");
@@ -746,7 +751,6 @@ final class PresentationService
 
             // check if there is any file sent
             if($hasFile){
-                $file = $request->file('file');
                 if (!in_array($file->extension(), $allowed_extensions)) {
                     throw new ValidationException(
                         sprintf("file does not has a valid extension '(%s)'.", implode("','", $allowed_extensions)));