Hi - I have existing parquet files in Cloudflare R2 storage (created outside of Databricks).  I would like to share them via Delta Share, but I keep running into an error.  Is it possible to share existing parquet files without duplicating them?

I did the following steps:

1. Created storage credential and external location pointing to an R2 bucket in Databricks Workspace (AWS)

2. Created catalog: 

CREATE CATALOG IF NOT EXISTS <catalog_name>
MANAGED LOCATION 'r2://<bucket_name>@<account_id>.r2.cloudflarestorage.com'
COMMENT 'Location for managed tables and volumes to share using Delta Sharing';

3. Created delta table: 

CONVERT TO DELTA parquet.`r2://<bucket_name>@<account_id>.r2.cloudflarestorage.com/<folder_name>/`;

CREATE TABLE IF NOT EXISTS <catalog_name>.<schema_name>.<table_name>
USING DELTA
LOCATION '<bucket_name>@<account_id>.r2.cloudflarestorage.com/<folder_name>/';
​

4. Created share: 

create share if not exists <share_name>;​

5. Tried adding table to share (this fails): 

ALTER SHARE <share_name> 
ADD TABLE <catalog_name>.<schema_name>.<table_name>;​

On step 5, I get the following error: 

[RequestId=<id> ErrorClass=INVALID_STATE] An error occurred while trying to validate the partition spec of a shared table.

Step 5 works if I run the following after step 3 and use the new table instead, but this duplicates the data in R2, which is what I'm trying to avoid: 

CREATE TABLE IF NOT EXISTS <catalog_name>.<schema_name>.<new_table_name> DEEP CLONE <catalog_name>.<schema_name>.<old_table_name>
  LOCATION 'r2://<bucket_name>@<account_id>.r2.cloudflarestorage.com/<new_folder_name>/';

Steps 1-5 work with using Amazon S3 external location instead of Cloudflare R2.  Is there any way to share existing parquet files in R2 without duplication?