Validate changed files in last commit

Hi,

I created the Pipeline using https://marketplace.visualstudio.com/items?itemName=touchify.vsts-changed-files and also test manually.

The problem is when execute the pipeline, I need validate only the new files but the Azure Pipeline execute a reset HARD and therefore I don't have multiple commit in pipeline and I can't validate the files that different in new commit.

How can I validate only the new files?

My company has repositories in Azure DevOps of .Net and inside the repository has the SRC directory with multiple functions. Each function contains its respective pipeline then I need check what function had alterations for run the pipleine.