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Seeking for advice here. My workflow is as below:
Mobile app send photo/video to spring boot backend, spring boot upload it to cloud object storage and add metadata to database. Question is: While spring boot is uploading file to cloud, how to respond mobile client immediately and notify them about upload success?
I thought of creating work request and let client poll it.

I did sth similar with springs `@Async`  maybe that helps. However in most cases uploading the data from a client to the backend takes significantly more time and most cloud storages uploads from within the network should only take a small portion of the total time. So you _might_ try to optimize on the wrong end here.

I used springs `@Async` too, but was thinking about that point if I can improve. Anyway you're correct.   Just fire and forgot options is fine.