I understand you are having some difficulties with the transferring your VM SEsparse images to EC2 AMI. We suggest to convert  your VM SEsparse images to a supported format before importing to EC2 AMI using VM Import/Export tool.
For your information: SEsparse is a type of disk format that can be used when creating VMDK images, but it is not a supported format by VM Import/Export tool.
Please contact if you have any further questions, and feel free to reach out to us via a support case to facilitate a discussion on the specifics of your resources.
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