Hi @TatKkkkkR ,
I assume that your environment is hosted in managed cloud. Hence, even though you have provided the attachment path to the blob storage it won’t directly allow you to the access the stored attachments externally. In order to make this work, you will need to request for a SAS (shared access signature) token key to Azure storage. When you open up the cloud-ops request, (if the hosted environment belongs to ifs cloud) make sure to provide a reasonable validity period for the token just to make sure that it will not expire soon.
Once you received the sas token key, you need to simply append the key at the end of your attachment path url, similar to the example below. You can test whether the attachment is displayed in your browser itself by browsing through the same link.
https://yourblogstorage.blob.core.windows.net/attachments/image_id01.png?the_sas_token_key_value
Then the same attachment path with SAS token key should be added to your rdlc query so that it should correctly display the image on your report.
Did you already check the ATTACHMENT_DIRECTORY app param whether it has been updated with the blob URL? https://gilbfsmdevstorage.blob.core.windows.net/attachments
Otherwise, you may need to check the SAS token key validity with the cloud ops team.