How to upload 25GB files into Azure blob storage from an Azure app Services

Hi All, my customer wants to upload a 25 GB zip file from a REACT application exposed through an application gateway.

My initial thought was to use the BLOB SDK in the REACT app and upload it to an Azure storage account using a SAS token. However, due to security risks, this will not be approved. 

The project uses APIM; one option is to expose an endpoint in APIM and then use a custom policy to upload the file to a storage account. However, this will degrade APIM performance and the rest of the application.

Can I expose an endpoint in the application gateway, but App Gateway has limitations and does not support chuck upload?  Can someone please point me in the right direction?

Thank you