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Base64-encoded content too large

I have a Backend API workflow that get is base64 value from external server webhooks. When a file of 10MB is sent to this workflow, it works, but when for example a 22MB file is sent to the Backend API workflow, the server receive the " text too long for this field." error response from bubble.

For example, the image below is using postman.

Does that mean, bubble text field can’t handle a text size of 20MB above and if not, what is the workaround when handling a file of this size through webhooks?