Hello,
We are a team of experienced developer & we can share a demo app for this with you to test as we were preparing that for the same project posted by other owner here.
If you like the demo, please note that you will need to pay weekly on freelancer as per the bid.
Also, the demo works with our google account. For the actual work, you will need to share your gmail account to use for firebase & GCP storage.
Thank you.