Uploading Media is Not Working Probably

You should replace strapi::security string with the object below in ./config/middlewares.js

 {
    name: 'strapi::security',
    config: {
      contentSecurityPolicy: {
        useDefaults: true,
        directives: {
          'connect-src': ["'self'", 'https:'],
          'img-src': ["'self'", 'data:', 'blob:', 'yourBucketName.s3.yourRegion.amazonaws.com'],
          'media-src': ["'self'", 'data:', 'blob:', 'yourBucketName.s3.yourRegion.amazonaws.com'],
          upgradeInsecureRequests: null,
        },
      },
    },
  },
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