Remove file from file attachment attribute

Summary:

I have an attribute of type file attachment and I would like to use a commerce library function to remove the file
that was attached/uploaded. I am not sure what is the syntax for performing this action (remove file) with a commerce library function.
Anyone here had a similar requirement and knows how this can be performed?

Content (please ensure you mask any confidential information):

I have an attribute of type file attachment and I would like to use a commerce library function to remove the file that was attached/uploaded. I am not sure what is the syntax for performing this action (remove file) with a commerce library function. Anyone here had a similar requirement and knows how this can be performed?