Fix sending attachments from the camera.

// FREEBIE

Signal/src/view controllers/MessagesViewController.m

@@ -1916,6 +1916,8 @@ typedef enum : NSUInteger {
 - (void)imagePickerController:(UIImagePickerController *)picker
     didFinishPickingMediaWithInfo:(NSDictionary<NSString *, id> *)info
 {
+    OWSAssert([NSThread isMainThread]);
+    
     [UIUtil modalCompletionBlock]();
     [self resetFrame];
 
@@ -1928,11 +1930,19 @@ typedef enum : NSUInteger {
         // Video picked from library or captured with camera
 
         NSURL *videoURL = info[UIImagePickerControllerMediaURL];
+        [self dismissViewControllerAnimated:YES
+                                 completion:^{
                                      [self sendQualityAdjustedAttachmentForVideo:videoURL];
+                                 }];
     } else if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
         // Static Image captured from camera
 
         UIImage *imageFromCamera = [info[UIImagePickerControllerOriginalImage] normalizedImage];
+        
+        [self dismissViewControllerAnimated:YES
+                                 completion:^{
+                                     OWSAssert([NSThread isMainThread]);
+                                     
                                      if (imageFromCamera) {
                                          SignalAttachment *attachment = [SignalAttachment imageAttachmentWithImage:imageFromCamera
                                                                                                            dataUTI:(NSString *) kUTTypeJPEG];
@@ -1949,6 +1959,7 @@ typedef enum : NSUInteger {
                                      } else {
                                          failedToPickAttachment(nil);
                                      }
+                                 }];
     } else {
         // Non-Video image picked from library