An error "UnexpectedCancel" displays in the activity log when uploading items to one attached blob container which SAS URL is created by an access policy (List, Read)

Storage Explorer Version: 1.21.0
Build Number: 20210908.7
Branch: rel/1.21.0
Platform/OS: Windows 10/Linux Ubuntu 20.04/MacOS Big Sur 11.4
Architecture: ia32\x64
How Found: From running test case
Regression From: Not a regression

Steps to Reproduce

1. Expand one storage account -> Blob Containers.
2. Create a blob container -> Right click the blob container.
3. Click 'Manage Access Policies...' -> Add one access policy with 'Read, List' permissions.
4. Generate a SAS URL via the access policy.
5. Attach the blob container via the SAS URL.
6. Upload one blob to the attached blob container -> Click 'OK' on the prompt detected dialog.
7. Check whether a helpful error message displays in the activity log.

Expected Experience

A helpful error message displays in the activity log.

Actual Experience

An error "UnexpectedCancel" displays in the activity log.

Error Details:
{ "message": "\"UnexpectedCancel\"" }

Additional Context

1. Here is the AzCopy log:
   0238cd79-e76f-ab4d-6af8-414b55630e88.log
2. This issue also reproduces for ADLS Gen2 blob containers/file shares.
3. This issue doesn't reproduce when attaching via SAS permissions.

Start with the listed reproduction steps for a blob container attached using an access-policy SAS, then inspect the linked AzCopy log and compare the activity-log handling with direct SAS permissions. Done means uploads no longer surface only "UnexpectedCancel" and instead display a helpful error message, including for the reported ADLS Gen2 and file-share cases.