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Hello @Simon R
As I understand from your description, the previous workaround of using specific link patterns to bypass the Adobe integration is no longer reliable. Despite your attempts, SharePoint is now automatically appending the ?web=1 query parameter to the URLs, which forces PDFs to open in the Adobe viewer and unintentionally exposes your document library structure to end users.
This behavior aligns with a broader Microsoft service update rolled out around 2026, in which the integration between SharePoint and Adobe Acrobat has been further tightened and positioned as the default PDF viewing experience. Unfortunately, this change comes at the expense of many customization and URL-masking techniques that organizations previously relied on.
Since this is a tenant-level behavior enforced by Microsoft and there is currently no truly effective workaround for this issue, I highly recommend posting your specific scenario in the Microsoft Tech Community - Home | Microsoft Community Hub
I apologize for redirecting you elsewhere, but in this case, broadening the discussion may help you reach a wider audience and potentially receive creative or alternative ideas from other users facing the same challenge. This also increases the overall chance of discovering a suitable solution.
If you receive any updates or find a viable approach, it would be greatly appreciated if you could share it here as well to help others who may be experiencing the same issue. Thank you very much for your willingness to contribute to the community.
Wishing you all the best!
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