code: public ImageInserter withInsertableImages(InsertableImage... insertableImages) {
          if (this.insertableImages == null) {
              setInsertableImages(new java.util.ArrayList<InsertableImage>(insertableImages.length));
          }
          for (InsertableImage ele : insertableImages) {
              this.insertableImages.add(ele);
          }
          return this;
      }
docs: Specify the images that you want to overlay on your video. The images must be PNG or TGA files.
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setInsertableImages(java.util.Collection)} or {@link #withInsertableImages(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param insertableImages
  Specify the images that you want to overlay on your video. The images must be PNG or TGA files.
  @return Returns a reference to this object so that method calls can be chained together.