Hi @JILIN MR
Thank you for posting in Q & A.
Yes, you can add new file/data to the immutable storage, can't overwrite the same file.
A time-based retention policy stores blob data in a Write-Once, Read-Many (WORM) format for a specified interval. When a time-based retention policy is set, clients can create and read blobs, but cannot modify or delete them. After the retention interval has expired, blobs can be deleted but not overwritten.
If the Answer is helpful, please click Accept Answer
and up-vote, so that it can help others in the community looking for help on similar topics.