The file system market-uploads has mount targets in us-east-1a and us-east-1b, guarded by the group uploads-efs-p8eu9a. The web servers web-a-p8eu9a and web-b-p8eu9a run in those zones in the group web-p8eu9a, with instance profiles for Session Manager.

1. Let the web servers' group reach the mount targets on the port EFS uses.

2. Find the file system's id:

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   aws efs describe-file-systems --query "FileSystems[0].FileSystemId" --output text

3. On web-a-p8eu9a, mount it on /mnt/uploads and save a note there:

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   sudo cp /etc/hostname /mnt/uploads/from-a.txt

4. On web-b-p8eu9a, mount it on /mnt/uploads too, and look for the note with ls.