Saving new files in CDM via Databricks, save seems to overwrite the old files

[WolakT]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [x ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

saving an arbitrary spark df to a CDM folder: '''(spark_df.write.format("com.microsoft.cdm") .option("entity", CDMentity ) .option("appId", appID) .option("appKey", appKey) .option("tenantId", tenantID) .option("cdmFolder", outputLocation) .option("cdmModelName", CDMmodelName) .save())'''

Any log messages given by the failure

the csv file in snapshot folder has been overwritten

Expected/desired behavior

Tried passing file name in save but without success.```