Under Trigger Monitor Files
In File Path Field enter:
/tmp/temp/tmp/*

Result in Trigger Log:

Polling on master.
Checking one file: '/tmp/temp/tmp/testfile'.
Polling complete. Took 0 ms.

This is the expected behavior.

In File Path Field enter:
"/tmp/**/tmp/*"

Error in Trigger Log:
Polling on master.
The folder path '/tmp/**/tmp' doesn't exist.
The computed file doesn't exist.

Expected behavior:
the glob for the directory at ** (temp) should have been expanded.