Cloudflare Worker with R2 storage for image/file hosting.
Create a cloudflare worker and R2 Storage. Configure the wrangler.toml file to your liking. Create an ENCRYPTED environment variable in your worker panel called "AUTHORIZATION_KEY" with a secure random key.
Create a Custom Uploader in the sharex app Set the "Method" to POST. Add a header called AUTH with your Random key from the worker installation. Set the "Body" option to Binary. Set the URL entry at the bottom to "{response}".
POST "/" Body: the file you want to upload. Headers: Auth = Your Authorization Key.
GET "/{imageId}" Returns the image.