diff --git a/app/helpers/reports_helper.rb b/app/helpers/reports_helper.rb
index f6fce8d87..0cae132a5 100644
--- a/app/helpers/reports_helper.rb
+++ b/app/helpers/reports_helper.rb
@@ -97,21 +97,8 @@ module ReportsHelper
   end
 
   # "Hack" to omit file preview URL because of WKHTML issues
-  def report_image_asset_url(asset, type = :asset, klass = nil)
-    prefix = ''
-    if ENV['PAPERCLIP_STORAGE'].present? &&
-       ENV['MAIL_SERVER_URL'].present? &&
-       ENV['PAPERCLIP_STORAGE'] == 'filesystem'
-      prefix = ENV['MAIL_SERVER_URL']
-    end
-    if !prefix.empty? &&
-       !prefix.include?('http://') &&
-       !prefix.include?('https://')
-      prefix = "http://#{prefix}"
-    end
-    size = type == :tiny_mce_asset ? :large : :medium
-    url = prefix + asset.url(size, timeout: Constants::URL_LONG_EXPIRE_TIME)
-    image_tag(url, class: klass)
+  def report_image_asset_url(asset, _type = :asset, klass = nil)
+    image_tag(asset.generate_base64(:medium), class: klass)
   end
 
   # "Hack" to load Glyphicons css directly from the CDN
diff --git a/app/models/asset.rb b/app/models/asset.rb
index 6d7b332e6..a03a27882 100644
--- a/app/models/asset.rb
+++ b/app/models/asset.rb
@@ -493,6 +493,16 @@ class Asset < ApplicationRecord
     !locked? && %r{^image/#{Regexp.union(Constants::WHITELISTED_IMAGE_TYPES_EDITABLE)}} =~ file.content_type
   end
 
+  def generate_base64(style)
+    image = if file.options[:storage].to_sym == :s3
+              URI.parse(url(style)).open.to_a.join
+            else
+              File.open(file.path(style)).to_a.join
+            end
+    encoded_data = Base64.strict_encode64(image)
+    "data:#{file_content_type};base64,#{encoded_data}"
+  end
+
   protected
 
   # Checks if attachments is an image (in post processing imagemagick will
diff --git a/db/schema.rb b/db/schema.rb
index 42cf7ba6d..ba5dc8029 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -56,7 +56,7 @@ ActiveRecord::Schema.define(version: 20190520135317) do
     t.datetime "updated_at", null: false
     t.string "file_file_name"
     t.string "file_content_type"
-    t.integer "file_file_size"
+    t.bigint "file_file_size"
     t.datetime "file_updated_at"
     t.bigint "created_by_id"
     t.bigint "last_modified_by_id"
@@ -169,7 +169,7 @@ ActiveRecord::Schema.define(version: 20190520135317) do
     t.datetime "updated_at", null: false
     t.string "workflowimg_file_name"
     t.string "workflowimg_content_type"
-    t.integer "workflowimg_file_size"
+    t.bigint "workflowimg_file_size"
     t.datetime "workflowimg_updated_at"
     t.uuid "uuid"
     t.index ["archived_by_id"], name: "index_experiments_on_archived_by_id"
@@ -737,14 +737,14 @@ ActiveRecord::Schema.define(version: 20190520135317) do
     t.datetime "updated_at", null: false
     t.string "file_file_name"
     t.string "file_content_type"
-    t.integer "file_file_size"
+    t.bigint "file_file_size"
     t.datetime "file_updated_at"
   end
 
   create_table "tiny_mce_assets", force: :cascade do |t|
     t.string "image_file_name"
     t.string "image_content_type"
-    t.integer "image_file_size"
+    t.bigint "image_file_size"
     t.datetime "image_updated_at"
     t.integer "estimated_size", default: 0, null: false
     t.integer "step_id"
@@ -857,7 +857,7 @@ ActiveRecord::Schema.define(version: 20190520135317) do
     t.datetime "updated_at", null: false
     t.string "avatar_file_name"
     t.string "avatar_content_type"
-    t.integer "avatar_file_size"
+    t.bigint "avatar_file_size"
     t.datetime "avatar_updated_at"
     t.string "confirmation_token"
     t.datetime "confirmed_at"
@@ -924,7 +924,7 @@ ActiveRecord::Schema.define(version: 20190520135317) do
     t.datetime "updated_at", null: false
     t.string "zip_file_file_name"
     t.string "zip_file_content_type"
-    t.integer "zip_file_file_size"
+    t.bigint "zip_file_file_size"
     t.datetime "zip_file_updated_at"
     t.string "type"
     t.index ["user_id"], name: "index_zip_exports_on_user_id"