jMeter: load file content on http request body

I'm trying to inject file content into the request body:

I'm using:

${__FileToString(${__eval(${bundle})},,)}

I've configured the bundle variable using the directory listing plugin:

When I perform the test, I'm getting:

Logs is getting me:

2021-12-28 16:33:53,853 WARN o.a.j.f.FileToString: Could not read open: /patient-bundle-0193.json

According to my configuration, __FileToString should read from /home/jeusdi/projects/workarea/salut/mpi/jsons/bundles/extractions/10000/bundles instead from /...

Any ideas?

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