You can import files directly from AWS using presigned S3 URLs

  1. First, generate a presigned link for an S3 object in the AWS console. 
  2. Then in Gigasheet select Link in the upload popup. 
  3. Paste the presigned URL in and your file will be loaded from S3 without you ever having to download anything! 

See the How to Page for step-by-step visual instructions.