File upload issue in Apigee Drupal 8 dev portal

As part of recent upgrade, Drupal version changed to 8 on Apigee Dev portal. We successfully have the portal up and running in QA environment but we are seeing an issue with file upload functionality.

Max size for file upload is 4MB but when we are uploading 0-4MB files, getting below error:

"An unrecoverable error occurred. The uploaded file likely exceeded the maximum file size (4 MB) that this server supports."

Surprisingly, when performing file upload accessing portal at node level (with IP instead of reverse proxy DNS), it works. As per Middleware team, the proxy config is same for all applications and not specific to our portal.

Any suggestions are much appreciated.

Apigee version: 4.19.06 (OPDK)

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