Refreshing DELTA external table

[turtleXturtle]

I'm having trouble with the REFRESH TABLE command - does it work with DELTA external tables?  I'm doing the following steps:

1. Create table: CREATE TABLE IF NOT EXISTS `catalog`.`default`.`table_name` (
   KEY DOUBLE
   , CUSTKEY DOUBLE
   , STATUS STRING
   , PRICE DOUBLE
   , DATE TIMESTAMP
   , PRIORITY STRING
   )
   USING PARQUET LOCATION 's3://bucket-name/folder-name/';
2.  Convert to Delta: convert to delta `catalog`.`default`.`table_name`;
3. Add new parquet file to s3 folder
4. I tried REFRESH TABLE, then CONVERT TO DELTA again, which didn't work.  I also tried converting to delta first and then REFRESH TABLE, and I can't get the new file recognized.

I can't get the new file to show up in the created delta table without dropping and recreating the external table - is REFRESH TABLE supposed to work for DELTA external tables? Is there another order of operations I need to do to get the new file to be recognized in the existing delta external table?

[gchandra]

Step 3: Insert the Data; don't add it directly to the S3 folder.

Once it's converted to Delta, it maintains the transaction log. Inserting a Parquet file (followed by another convert /refresh) won't work, as the rest of the dataset is already Delta.