Hi @Nuthana ,
Thank you for posting query in Microsoft Q&A Platform.
Are you sure data inside .sav file is suitable to load as parquet file?
Try to rename .sav extension to .parquet manually and then try to load that .parquet file in to storage account and then from ADF create a dataset for that parquet file see under schema
tab of that dataset if you are getting schema correctly.
If yes, then inside sink tab of copy activity, create a dataset with binary type and then in the path of sink dataset mentioned filename field value with a filename ends with .parquet extension.
Please let me know how it goes.