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Deployment Pipeline Error: "The attachment is either not a valid type or is too large"

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Posted on by luisveltze

Recently, we installed the Deployment Pipeline Configuration app in one of our environments. Since our environments were previously linked to a different host, we force-linked all environments to the new host. After cleaning up and identifying which environments are for development and which are target environments, we successfully created a pipeline from Environment A to Environment B.

I had no issues creating the pipeline from the solution UI. However, when we attempted to deploy the solution, we encountered the following error:

{"error":{"code":"0x80043e09","message":"The attachment is either not a valid type or is too large. It cannot be uploaded or downloaded."}}

Previously, when the environments were linked to the old host, we had a pipeline from Environment A to B and never experienced this error.
Has anyone encountered this issue before? Any guidance on how to resolve it would be greatly appreciated.

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developerAJ 4,201 on at

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Deployment Pipeline Error: "The attachment is either not a valid type or is too large"

Solution concepts with Power Platform - Power Platform | Microsoft Learn

please check your solution size if it's very huge i would suggest breaking them into multiple solution

if your solution size is less than 100mb there could be bug with modern view you can try import from classic view

If this solution helped you resolve your issue, kindly mark it as accepted — it makes it easier for others to find and also closes the discussion. If you found it useful, a Like ❤️ would be greatly appreciated!

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wolenberg_ 811 Moderator on at

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Deployment Pipeline Error: "The attachment is either not a valid type or is too large"

Hello , this error typically occurs when a solution contains attachments (like web files, portal content, or large notes) that exceed Dataverse’s size limits or use unsupported types. Re-linking environments may also disrupt how these files are referenced. To resolve it, identify and remove oversized or unsupported attachments from the solution before deployment.

Error: "The attachment is either not a valid type or is too large. It cannot be uploaded or downloaded."
• Cause: Likely due to oversized or unsupported attachments (e.g., portal files, web resources) in the solution, especially after re-linking environments to a new host.
• Fixes:
⁠◦ Inspect and remove large or invalid attachments from the solution.
⁠◦ Export as unmanaged and unpack with Solution Packager to identify problematic files.
⁠◦ Rebuild the solution without attachments if needed.
⁠◦ Confirm environments are properly registered in the Deployment Pipeline Configuration app.
Helpful Resource

• Microsoft Learn – The import file is too large to upload

If this helped or could help others in the community, feel free to give it a like or a kudo — it helps surface useful answers for everyone!

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developerAJ 4,201 on at

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Deployment Pipeline Error: "The attachment is either not a valid type or is too large"

if your query is resolved mark response as solution

If this solution helped you resolve your issue, kindly mark it as accepted — it makes it easier for others to find and also closes the discussion. If you found it useful, a Like ❤️ would be greatly appreciated!

🏷️ Please tag me @developerAJ if you still have any queries or issue persists

🤝 Let’s connect on LinkedIn

📘 Explore more on my articles

🐱‍💻 Github Link

💼👥 Looking for Jobs Power Platform & Microsoft Jobs Network

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