Correction: I am not getting a URL to download the ZIP file in FME Server Data Download when making the feature service or choosing download. 

Hi @izabreton, please check that:

1. Your workspace has been registered with the data download service. This can be done when publishing to FME Flow. See https://docs.safe.com/fme/html/FME-Form-Documentation/FME-Form/Workbench/fmeflow-register-workspace.htm
2. When the workspace was registered with the data download service, the GDB writer was not removed from the list of writers to include in the data download (this is visible when you click ‘Edit’ next to the Data Download service in the final ‘Register Services’ step of the publish wizard in FME Workbench).
3. When running the workspace on FME Flow, that it is being run on the Data Download service. If the workspace was registered with multiple services, it’s possible it’s not being run on the Data Download service. You can check the job log on FME Flow to see which service the job was run against by searching for the FME_SERVER_REQUEST_URI parameter. For example: 

   --FME_SERVER_REQUEST_URI' `https://myfme.flow/fmedatadownload/Samples/austinDownload.fmw

If you’re still having issues after this, I recommend submitting a case with the workspace .fmw file and job log from FME Flow.