If the function App itsn't displayed on the functions running but the files are there It's usually because there are some issues on code. I suggest you try using Azure functions core tools (https://learn.microsoft.com/en-us/azure/azure-functions/functions-run-local) to run on local and validate the function app works as expected: func start
When function running on local without problem you can deploy to the Azure function service again
References:
- https://learn.microsoft.com/en-us/azure/azure-functions/functions-get-started
- https://learn.microsoft.com/en-us/azure/azure-functions/functions-create-function-app-portal
If the information helped address your question, please Accept the answer.
Luis