Azure Template with a script can't find the script when the template is used in a different repo

I have an azure template that I want to reuse in different projects. One of the templates is using a script (also stored in that template project), but the pipeline job can't find the script. Any idea what route do I need to put in the template repo so other projects can find the script?

So the code is the following, this is the azure template in the Templates Repo:

> templates/my-template.yaml
---

steps:
  - task: PowerShell@2
    displayName: Run Script task
    env:
      SYSTEM_ACCESSTOKEN: $(System.AccessToken)
    inputs:
      targetType: 'filepath'
      filePath: ./scripts/my-script.ps1 # Can't find the path

And this is how I use it in the Project Repo:

resources:
  ...
   - repository: mytemplates
     type: git
     name: MyTemplates
     ref: refs/heads/main

...
stages:
  - stage: Test
    - jobs:
      - steps:
        - template: /templates/my-template.yaml@mytemplates

You have to use checkouts to get the template in different repository as below:

- checkout: rithtemplates
- template: /templates/template.yaml@mytemplates

Where as in Filepath use:

filePath: $(Build.SourcesDirectory)/scripts/rith.ps1

Output:

Then the script will be executed: