Power Automate cloud flow consistently fails with error:
The response to partial content upload initiating request is not valid. The response to initiating partial content upload request must contain a valid location header.
Details:
When: Since March 18, 2026. yesterday flow is ok
Where: "Update file" action to SharePoint Online/OneDrive.
Key finding: Fails only when "File Content" is dynamically referenced from previous "Get file content" action. Works fine with manually entered text.
Impact: Multiple business processes blocked.
Request:
Please investigate why SharePoint/OneDrive API fails to return valid Locationheader for chunked upload initiation, and provide fix/workaround.
Your Update file action is failing because Power Automate is forcing a chunked upload, and SharePoint/OneDrive is not returning the required Location header. This is a known behavior with chunked uploads. Fix: Turn OFF “Allow chunking” in the action settings.
This workaround has successfully resolved the same error for other users.
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