klz-cables.com/src/payload/collections/Media.ts

import type { CollectionConfig } from 'payload';

export const Media: CollectionConfig = {
  slug: 'media',
  access: {
    read: () => true,
  },
  admin: {
    useAsTitle: 'filename',
    defaultColumns: ['filename', 'alt', 'updatedAt'],
  },
  upload: {
    staticDir: 'public/media',
    adminThumbnail: 'thumbnail',
    imageSizes: [
      {
        name: 'thumbnail',
        width: 600,
        // height: undefined allows wide 5:1 aspect ratios to be preserved without cropping
        height: undefined,
        position: 'centre',
      },
      {
        name: 'card',
        width: 768,
        height: undefined,
        position: 'centre',
      },
      {
        name: 'tablet',
        width: 1024,
        height: undefined,
        position: 'centre',
      },
    ],
  },
  fields: [
    {
      name: 'alt',
      type: 'text',
      required: true,
    },
    {
      name: 'caption',
      type: 'text',
    },
  ],
};