Uploading a file to Azure File Storage

I have a url with a SAS token to upload a file. I have a base64 string of a previously defined content type that I need to upload.

import { FileUploadStreamOptions, ShareFileClient } from "@azure/storage-file-share";
import { Readable } from "readable-stream";

async submitData(context: ComponentFramework.Context<IInputs>, fileName: string, ext: string, base64: string, contentType: string, classification: string, upload: any) : Promise<boolean> {
   const buffer = Buffer.from(base64, 'base64');

   let client = new ShareFileClient(upload.url);
   let readable = Readable.from(buffer);

   const options = {
       fileHttpHeaders: { 
          fileContentType: contentType,
       },
   };

   await client.uploadStream(readable, buffer.length, 4 * 1024 * 1024, 5, options);
   console.log("Upload successful");
   
   // more logic
   return true;
}

I’m having two problems with this code:

1. The await client.uploadStream(readable, buffer.length, 4 * 1024 * 1024, 5, options); is not being awaited and the method is escaped.

2. The uploaded file is corrupted. When downloaded, the content comes back as:

{"$content-type":"application/pdf","$content":"AAAAAAAAAAAAAA...AAAAA"}

1. I have tried not awaiting the call and that seems to work for the most part although it really should be awaited.

2. I tried adding encoding to the stream but that didn’t seem to work either.