Modify Placeholder Image to Use Local Transparent Image; and Issue with Adding 6-Column and 8-Column Layouts

[TheSummerRain]

Hello there,
1、I would like to change the placeholder image to use a transparent image from my local machine. However, after modifying the code path, the reading mode works fine, but the real-time preview mode does not. I would like to use a relative path, but it's not working. I'm not sure what to do.

(u = [
...o,
...Array(a - o.length).fill({
type: "external",
link: "E:/myWrite/myNovel/all_image/image_gird/imm.png", // https://via.placeholder.com/640x480
}),
])

props: {
imageUrls:
l.length > 0
? l.map((u) => u.link)
: ["E:/myWrite/myNovel/all_image/image_gird/imm.png"], // wally https://via.placeholder.com/640x480
showThumbnails: !!o.data.carouselShowThumbnails,
},

2、I am looking to add image layouts with 6 columns and 8 columns. I'm not sure how to modify the code to achieve this. I hope to make it customizable.

[TheSummerRain]

preview mode：

reading mode：