Is it possible to publish a workbench to FME Server that will?
Let an end user upload a random (Esri) GDB with any type of content and random naming of features.
Be able to choose (dynamically) a feature within the GDB and transform that selected feature to example SHP.
Key points the choice dropdown list can’t be predefined/hardcoded, standard GDF formats to be used such as points, polylines, polygons, rasters not Datasets, Annotation, Topologies etc
This is probably a job for the FME Server Javascript library. Have a look at these examples:
https://playground.fmeserver.com/javascript/job-submission/populate-forms-dynamically/
https://playground.fmeserver.com/javascript/server-uploads/upload-file-drag-drop/
You could use the file drag and drop to allow a user to upload a file which is processed by a workspace that returns json containing the features. This json is then used to build the dropdown list and that is submitted to a second workspace that does the conversion to shp.
I'll look it it, cheers