Hi, I believe I have identified a false document-conflict condition when using Collabora Online 26.04 with Microsoft SharePoint as the native WOPI host. Environment Collabora Online: 26.04.3.1 WOPI host: Microsoft SharePoint Server WOPI endpoint: native /_vti_bin/wopi.ashx implementation Editi…

Great debugging; quite possibly we want to re-issue a CheckFileInfo if we don’t get the details back that we need; that would involve a small race, but avoid this problem. Thanks for the great analysis !

Thanks you, this is a very useful report. There is no private branch for SharePoint fixes: when we have any they end up on the main branch and possibly get backported. What you are reporting is definitely an issue. Whether the JSON payload is invalid or missing is something that Collabora Online ou…

False “Document changed in storage” conflict with SharePoint on 26.04 after successful PutFile without LastModifiedTime

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nsergiu September 2, 2026, 11:34am 4

Hi, thanks for the follow-up.

I tested it on SharePoint Server Subscription Edition, August 2026 update. (16.0.19725.20384)

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Topic		Replies	Views
After editing the document, on a page Reload it goes to Read-Only mode User Support english-en	1	419	April 8, 2023
I am opening a file in collabora online but can not read the content Development resolved	0	160	March 11, 2024
[WOPI][integration]: "Unlock" requests are called before "putFile" requests Development answered	2	456	January 23, 2023
If the document is not saved after modification and the browser is refreshed, the document will not be able to be loaded User Support english-en	9	591	June 22, 2023
Collabora Online with recent SharePoint versions (Subscription Edition, 2019) – feedback? User Support	2	134	June 15, 2026

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False “Document changed in storage” conflict with SharePoint on 26.04 after successful PutFile without LastModifiedTime

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