Unable to get blob from Azure Blob Storage Using External File Accounts

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Posted on by Harikrushna Sangani

Hello,

I'm trying to access a file stored in Azure Blob Storage using External File Accounts in Business Central. However, when I attempt to retrieve the file, I encounter the following error:
“Could not get Blob”

Has anyone experienced this issue before or can provide guidance on what might be causing it and how to resolve it?

Thank you!

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Dynamics 365 Business Central

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OussamaSabbouh 12,973 Super User 2026 Season 1 on at

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Hello,

The “Could not get Blob” error in BC almost always means a SAS token or permission issue, not a missing file: the SAS is expired, missing Read/List rights, scoped to the wrong container/folder, or the path/casing in BC doesn’t exactly match Azure Blob (Blob paths are case-sensitive). Regenerate a SAS with Read + List, verify the container and directory match exactly, test the SAS URL directly in a browser, and re-save the External File Account—once those align, the file opens normally
.

Regards,
Oussama Sabbouh

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Harikrushna Sangani 45 on at

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I can successfully access other files from Blob Storage; the issue occurs only with this blob and a few others. One common factor is that these blobs are larger than 150 MiB.

When I test the blob URL directly in a browser, the file opens without any issues. The problem only occurs when accessing it from Business Central.

Since, Business Central uses the HttpClient data type to retrieve data, and according to the documentation, HttpClient calls can fail if the response exceeds the allowed size limit (in MiB). For Business Central online, the limit is 150 MiB. This seems to align with the behavior I’m seeing for larger blobs.
Ref: https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/methods-auto/httpclient/httpclient-data-type#ways-that-httpclient-calls-can-fail

Is there any other way to achieve this in Business Central for large blob files?

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Khushbu Rajvi. 22,132 Super User 2026 Season 1 on at

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Harikrushna Sangani You are correct: for Business Central Online, this is expected behavior once the blob response is > 150 MiB.

No, not in a supported way. There is no alternative AL API that can download a single HTTP response payload larger than 150 MiB in BC Online.

I found two alternatives for large blobs (>150 MiB) in Business Central Online:
1) Use a time-limited SAS URL and let users download the file directly from the browser.
2) Use an Azure Function/Logic App as a proxy to return only a SAS link or metadata, avoiding the HttpClient size limit.

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