Hi ​@pragathjobs There is a setting when reading and when writing. I think you are following the great tutorial found here: Working with Geodatabase Field Aliases: Altering Alias Values – FME Support Center

Did you add a Feature Dataset in the writer? It should be optional but I wonder if that will push things into the gdb. 
Also: Are you using the OpenAPI writer? I wonder if that functionality may not be included in the OpenAPI File GDB license?
Hope some of this helps.

Hi ​@crutledge,
I am using openAPI writer so I guess that might be the issue. Thank you very much!

Hi ​@crutledge Atlast I found a solution. My target was to write the features to a gdb and then to Zip it and upload to S3. What I did is, created a gdb template with alias and pointed the open API writer to this gdb. Then this output was pointed to a filecopy and zip the same. Thanks a lot! cheers:)

I am glad to hear. I wonder why that is though. I have found that “sometimes” we have to Click “Yes” to “Create FS using File Upload”. Sometimes not….Am I reading your solution correctly?