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According to the repository, yes it's possible to send a folder to your azure blob storage <https://github.com/pulumi/pulumi-synced-folder> Check out the `examples/` folder.

But a folder stored outside my local??, that is, a folder stored in an aws s3 bucket

Are you saying you want to sync s3 to s3 ? or S3 to Azure ?

`s3 to azure`,
copy all s3 data to the container `$web` of the `static website`, in my storage account, i have the docs, but i dont know how obtain the `url of the s3 like the azure docs`
sorry for answering late

As far as I can tell, I don't think this is possible using this provider. If you need to perform such task, I would recommend loading the Azure and AWS SDKs into your app, and leveraging `pulumi.all()` to execute your custom code when the 2 "buckets" have been created.
I also opened a feature request to see what our  engineering team has to offer in this space. <https://github.com/pulumi/pulumi-synced-folder/issues/51>