Why is there an error in adding changed files to a previous commit?

Question

git

I'm working on the master branch. At the current stage of development, a certain stage is indexed, a commit is made and launched into the repository.
Next, I change the files and want to add them to the previous commit
I do git add .
Next $ git commit --amend
No rules in editor, save and exit
Status says:
On branch master
Your branch and 'origin/master' have diverged,
and have 1 and 1 different commits each, respectively. (use " git
pull" to merge the remote branch into yours) nothing to
commit, working tree clean /test.git '
How to add changed files to previous commit and push?

Answer 1

git push --force