Snap sosumi open access to external drive

Hello. I installed the sosumi (snap). I also have an external drive. Need to somehow transfer file ~/snap/sosumi/common/macos.qcow2 to an external drive. And so that in the end sosumi runs this file on an external drive and not on a local

I changed the config file launch … -drive id=SystemDisk,if=virtio,file=/mnt/home/sosumi/macos.qcow2 \

Now I am getting a program error qemu-system-x86_64: -drive id=SystemDisk,if=virtio,file=/mnt/home/sosumi/macos.qcow2: Could not open ‘/mnt/home/sosumi/macos.qcow2’: Permission denied

Help solve this dilemma

Perhaps the sosumi snap does not use the removable-media interface. However, AFAIK the snap is unmaintained and should effectively be unlisted, so I would not hold my breath that anything will be fixed there.

thanks for your reply