I was able to do something like that that takes HL7 messages and publishes them to GCP using the Java/ObjectScript code found here: github.com/mcmundt/isc-gcp-pubsub. Originally set this it up on HS 2020 which was relatively straightforward - mostly a matter of getting all the libraries worked out. I recently migrated that interface to HS 2024 which took some tweaking because of move to using External Language Servers/PEX components, switching from the intersystems-gateway-3.1.0 to intersystems-utils-4.1.5 library, and changes to com.intersystems.enslib.pex package that required some small changes to the original Java code.

This is mentioned here in docs here: https://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KE…

From what I can tell this occurs in the operation rather than the service (so if doing something in a process it would still have spaces) and though sort of implies that this occurs when using format codes like %f it will do this even if you specified an exact name like "Chart Note.pdf". There's no control over it that I can tell as an unconditional $TR of occurs right away in Ens.Util.File:CreateTimestamp which is what ends up being executed during file/SFTP operations. You would need to use a custom EnsLib.File.PassthroughOperation with updates to the two Set tFilename calls in OnMessage to use your own version of CreateTimestamp. There is actually one call directly to that but the other goes to the EnsLib.File.OutboundAdapter's CreateFilename method which calls CreateTimestamp. So might also need a custom adapter, referred to by the PassthroughOperation, but can probably get around that if going to this much trouble!