@Kaniz Fatmaโ : Hi Fatima,
mlflow-export-import is still not a recommended solution and has no support from Databricks. This is clarified by Databricks SA's themselves.
I have developed an another approach where I am capturing the statistics of a particular run which is needed to be migrated to higher env. (like pre-prod or prod) and then creating a mlflow run with those statistics instead of re-running the entire huge model. This is working perfectly and is within the logical support of Databricks.