Strapi upload provider for S3, which creates the bucket if it doesn't exist.

strapi-provider-upload-aws-s3-creating-bucket.js

const AWS = require('aws-sdk');
const s3Provider = require('strapi-provider-upload-aws-s3');

module.exports = {
  init(config) {
    const s3 = new AWS.S3({
      apiVersion: '2006-03-01',
      ...config,
    });

    const s3ProviderInstance = s3Provider.init(config);

    return {
      async upload(file, customParams) {
        const bucket = config.params?.Bucket || customParams?.Bucket;
        if (bucket) {
          try {
            await s3.headBucket().promise();
          } catch (e) {
            if (e.statusCode < 400 || e.statusCode >= 500) throw e;

            await s3.createBucket({
              CreateBucketConfiguration: {
                LocationConstraint: config.region,
              },
            }).promise();
          }
        }

        await s3ProviderInstance.upload(file, customParams);
      },
      delete(file, customParams) {
        return s3ProviderInstance.delete(file, customParams);
      },
    };
  },
};