You can create a S3 bucket and upload the ova file to that bucket using a web-based method.
To upload the OVA file using web-based method
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Log in to the AWS console and go to Services.
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Go to S3, and click Create a bucket.
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Enter a name for the bucket and select the appropriate region. Click Create.
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Once the bucket gets created, open the bucket and click Upload. Click Add files and then select the OVA file from your local disk.
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Click Start Upload.
See Deploying the virtual appliances in AWS