What is the right way to modify less files?

I want to modify some LESS files in /admin/assets/less/freepbx. What is the best way to to this without getting tampered warnings and loosing changes after an update?

I tried to slove this by creating a new module and uploaded the less files to the newmodule/assets/less folder. This generated an error.

How to accept “tampered file” notification? - FreePBX / Security - FreePBX Community Forums

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