Is there any way to replace an object in Blobstore?

I can upload files to Blobstore without problems, but sometimes users
upload files in wrong sizes.
So I would like to get the uploaded file, resize it and store it on
Blobstore.

I'm using Java to do it.
I tried to resize file and than make a new http request to the app,
but the Blobstore does not get the new Image.

Any ideas about what I want to do?
I didn't find anything in the docs that could help me to replace an
blobstore object too.

Best regards,
Rafael
www.yaw.com.br

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