Greetings, Thank you for reaching out to AWS re:Post, I understand that you are having mounting your EFS as a volume on Fargate.
To mount an EFS system on Fargate
Open Amazon ECS -> Create New Task Definition -> Select FARGATE as launch type compatibility -> Entenr Task Definition Name -> Enter EFS as Volume Type -> Add container and Create
Please refer to the document below for a further explanation 
To verify your EFS is successfully mounted, check your task logs, reference to document below 
Please contact if you have any further questions, or reach out to us via a support case to facilitate a discussion on the specifics of your resources.
Hope you have a wonderful day.
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