update

resources/views/app/patient/documents.blade.php

@@ -17,7 +17,7 @@
                     </div>
                     <div class="mb-2">
                         <label for="" class="text-sm text-secondary mb-1">File *</label>
-                        <input type="file" class="form-control form-control-sm" name="file"
+                        <input type="file" class="form-control form-control-sm" accept="application/pdf, image/*" name="file"
                                value="" placeholder="File" required>
                     </div>
                     <div class="mb-2">

resources/views/app/pdf/viewer.blade.php

@@ -52,7 +52,8 @@
                             self.render();
                         }, function (reason) {
                             // self.pdfNotFound = reason.message;
-                            alert(reason.message);
+                            self.preloader(false);
+                            self.parent.html('<img src="'+url+'" class="w-100" />');
                         });
                     },
                     preloader: function(show){