Hi@lazarlubomir,a workaround I can think of is,write the destination dataset into a temporary file with the FeatureWriter,move it by a File Copy writer connected to the Summary port of the FeatureWriter,and include the File Copy writer in the download when you publish the workspace to the FME Server.The TempPathnameCreator can be used to create a temporary file path at run time.
At the moment only traditional writers are included in the data download service but we are looking at adding feature writer support either in 18.1 or 2019 FME Server.