Does the Corrigo Enterprise API's Blob.Body (or the overall API request) have a payload size limit enforced by the WAF/CDN layer?

We're sending document attachments via WoCreateCommand with a Blob containing a
Base64-encoded Body. Small images (~10KB) succeed, but images above ~100KB fail with an
"Access Denied" HTML response from errors.edgesuite.net (Akamai CDN, reference
18.d2b42e17.1786495595.1ea5f912).

This suggests the request body is being rejected by an edge WAF rule before it reaches the
Corrigo application server.

Questions:

Is there a documented maximum request body size for the /api/v1/cmd/ endpoints?
Does the WAF enforce a specific payload size limit (e.g., 100KB, 128KB)?
Is there a recommended approach for uploading larger attachments — for example, using a
separate attachment upload endpoint, chunked upload, or a pre-signed URL pattern?
If we need to attach files larger than the limit, is there an alternative flow (e.g.,
upload file to a storage service first, then reference it by URL)?