Copy & fetch files in Ansible/Cygwin - ansible

Question

Question - - how do you navigate the cygwin path structure for file transfers, copies and fetches?
I've installed ansible on a windows 10 machine using cygwin. Everthing works except for the ansible.builtin.copy task. Here is the setup
Relevant Directory Structure
C:.
├───.github
│ └───workflows
├───files
└───payload
├───communication
├───monitoring
The playbook sits in the documents directory of the user, so . is C:/Users/user/Documents/
Ansible Task
- name: Download YAML payloads
ansible.builtin.copy:
src: payload
dest: /some/directory/
The ansible cygwin command line actually runs from /cygdrive/c/Users... path. I can navigate to the payload directory from either windows cli or the cygwin cli using their native paths. [Must be a symlink?] In any event - when I run the above task, the src directory is not found.
What I've tried - both absolute and relative path variables in the src line, for both the cywgin and the windows paths. I've also tried using the inventory environment variables ({{ playbook_dir }}). fileglob: didn't work either.
What I haven't tried - {{ role_path }}. I'd like to keep the source YAMLs all together in the top directory. But not sure if this would work by putting the files directory under a role.
added details
Path to playbook from windows
C:\Users\billr\Documents\GitHub\home-k3s
Path to playbook from cygwin
/cygdrive/c/Users/billr/Documents/GitHub/home-k3
files & directories
home-k3s
files // these are the files/dirs I'm looking to copy
payload
communication
first.yaml
second.yaml
monitoring
first.yaml
second.yaml
hosts.ini //contains playbook hosts.
test.yml //this is the playbook I'm running
playbook cat
---
- hosts: master
gather_facts: yes
become: yes
tasks:
- name: Download YAML payloads
ansible.builtin.copy:
src: payload
dest: /home/bill/
Run #1
src: payload <-- this is the method per docs (for linux).
result: FAILED! => {"changed": false, "msg": "Source payload not found"}
Run #2
src: "{{ playbook_dir }}/files/payload"
result: FAILED! => {"changed": false, "msg": "Source /cygdrive/c/Users/billr/Documents/GitHub/home-k3s/files/payload not found"}
Run #3
src: "/cygdrive/c/Users/billr/Documents/GitHub/home-k3s/files/payload"
result: FAILED! => {"changed": false, "msg": "Source /cygdrive/c/Users/billr/Documents/GitHub/home-k3s/files/payload not found"}
Run #4
src: "c:/Users/billr/Documents/GitHub/home-k3s/files/payload"
FAILED! => {"changed": false, "msg": "Source c:/Users/billr/Documents/GitHub/home-k3s/files/payload not found"}
Note that I can see the files from the cygwin terminal with ls and I can see the files from the windows cli with dir.
Final Notes
Cygwin Github Issue Link