if you're offloading work from an endpoint you might be interested in this guide

https://docs.prefect.io/v3/deploy/static-infrastructure-examples/background-tasks

otherwise if want to keep just triggering a fully fledged deployment, the issue is likely how you're configuring the storage for the deployment you're triggering. Because of the formatting and lack of detail in the question its hard to tell
- what kind of work pool you're using
- what directory you're running prefect deployment from

you might want to check out the template repo with many examples like this

https://github.com/zzstoatzz/prefect-pack/blob/main/prefect.yaml