diff --git a/app/controllers/chunks_controller.rb b/app/controllers/chunks_controller.rb
index 1a291da370c3f79afbe8b8f5d09ffc0e6d701643..be663c6f83cc362d0027c3bd32f31a05e7120ccb 100644
--- a/app/controllers/chunks_controller.rb
+++ b/app/controllers/chunks_controller.rb
@@ -7,19 +7,26 @@ class ChunksController < ApplicationController
   def show
     chunk = resumable_chunk chunk_number
 
-    if File.exists?(chunk)
-      post_file_and_create_thumbnail @learning_object, resumable_filename if last_chunk?
-      #Let resumable.js know this chunk already exists
-      render :nothing => true, :status => 200
+    unless valid_mime_type?
+      render :nothing => true, :status => 415
     else
-      #Let resumable.js know this chunk doesnt exists and needs to be uploaded
-      render :nothing => true, :status => 404
+      if File.exists?(chunk)
+        post_file_and_create_thumbnail @learning_object, resumable_filename if last_chunk?
+        #Let resumable.js know this chunk already exists
+        render :nothing => true, :status => 200
+      else
+        #Let resumable.js know this chunk doesnt exists and needs to be uploaded
+        render :nothing => true, :status => 404
+      end
     end
-
   end
-
   #POST /chunk
   def create
+
+    unless valid_mime_type?
+      return render :nothing => true, :status => 415
+    end
+
     #chunk path based on the parameters
     chunk = resumable_chunk chunk_number
 
@@ -101,6 +108,13 @@ class ChunksController < ApplicationController
     @learning_object = LearningObject.find chunks_params[:learning_object_id]
   end
 
+  def resumable_file_extension
+    File.extname(chunks_params[:resumableFilename])[1..-1]
+  end
+
+  def valid_mime_type?
+    @learning_object.object_type.mime_types.map(&:extension).include? resumable_file_extension
+  end
   # Never trust parameters from the scary internet, only allow the white list through.
   def chunks_params
     params.permit(:file, :learning_object_id, :resumableIdentifier, :resumableFilename, :resumableChunkNumber, :resumableTotalChunks, :resumableChunkSize)
diff --git a/app/helpers/learning_objects/builder_helper.rb b/app/helpers/learning_objects/builder_helper.rb
new file mode 100644
index 0000000000000000000000000000000000000000..53f5cdc33a2640744b32f850a2b2b1c4a9ec0161
--- /dev/null
+++ b/app/helpers/learning_objects/builder_helper.rb
@@ -0,0 +1,5 @@
+module LearningObjects::BuilderHelper
+  def get_mime_types learning_object
+    @learning_object.object_type.mime_types.map(&:extension)
+  end
+end
\ No newline at end of file
diff --git a/app/views/learning_objects/build/_file_upload_form.html.erb b/app/views/learning_objects/build/_file_upload_form.html.erb
index 1be80ee18d85bb9cfdf1cebc979e39983eda368a..5c2314f2fedd8bfb2216df354eb1357d64c52abe 100644
--- a/app/views/learning_objects/build/_file_upload_form.html.erb
+++ b/app/views/learning_objects/build/_file_upload_form.html.erb
@@ -161,7 +161,7 @@
             maxFiles: 3,
             simultaneousUploads: 4,
             chunkSize: 1024 * 256,
-            fileType: []
+            fileType: <%= raw(get_mime_types @learning_object) %>
         });
 
         var results = $('#results'),
diff --git a/app/views/management/mime_types/_form.html.erb b/app/views/management/mime_types/_form.html.erb
index 5b165af2ee1c132b746556c2b74f2cb197f4472c..ddafa69c442003bbba168e81380795a51e158796 100644
--- a/app/views/management/mime_types/_form.html.erb
+++ b/app/views/management/mime_types/_form.html.erb
@@ -13,7 +13,11 @@
 
     <fieldset>
       <label class="ls-label col-md-6">
-        <b class="ls-label-text">Extensões</b>
+        <b class="ls-label-text">Extensões&nbsp
+          <a style="text-decoration: none;" href="#" data-toggle="popover" title="Informação" data-trigger="hover" data-content="Inclua somente a extensão. Exemplo: 'jpg' e não '.jpg'">
+            <i class="ls-ico-info"></i>
+          </a>
+        </b>
 
         <p>Digite o nome do tipo</p>
         <%= f.text_field :extension, {required: true} %>
@@ -31,3 +35,8 @@
       <%= link_to "Cancelar", management_mime_types_path,class: "ls-btn-danger"%>
     </div>
 <% end %>
+<script>
+  $(document).ready(function(){
+    $('[data-toggle="popover"]').popover();
+  });
+</script>
diff --git a/app/views/management/mime_types/index.html.erb b/app/views/management/mime_types/index.html.erb
index 79f73dcdeeb9c1a770545e0af537469d1f20ded9..3ff644214786f3a057bc6831812d5524f1d38c4b 100644
--- a/app/views/management/mime_types/index.html.erb
+++ b/app/views/management/mime_types/index.html.erb
@@ -3,7 +3,7 @@
 <table class="ls-table">
   <thead>
   <tr>
-    <th>Nome</th>
+    <th>Extensão</th>
     <th>MimeType</th>
     <th></th>
     <th></th>