MWPRO IMPACT SCORE
OPERATIONAL IMPACT
64
0
25
50
75
100
HIGH IMPACT • REVIEW RECOMMENDED
Recommended Action:
Review the update and plan any required actions before rollout.
Review the update and plan any required actions before rollout.
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Primary Audience
Power Platform AdminsMicrosoft 365 AdminsIT ManagersService OwnersDevelopers
Why this score?
AI Confidence
HIGH
Enough detail is available to trust this assessment.
Assessment Reasoning
Microsoft is changing the behaviour of SharePoint triggers and actions in Power Automate on 18 September 2026. Existing flows using the current thumbnail URL will fail unless updated to the new Get file thumbnail action. This introduces a fixed deadline, requires flow inspections and updates, and adds testing effort. Direct end-user impact is low as disruption occurs within automated processes, but admins and developers must act promptly to avoid broken workflows.
78
Admin Impact
22
User Impact
70
Urgency
72
Effort
WHAT YOU NEED TO KNOW
AT A GLANCE
SharePoint triggers will stop returning a valid thumbnail URL. Flows using this URL need updating to avoid failures.
END USERS
No major end-user change expected.
IT ADMINS
Review and update any flows or agents using thumbnail URLs to the new Get file thumbnail action.
ROLLOUT TIMELINE
Upcoming:
18 September 2026
18 September 2026
📢 Official Microsoft Message Center Announcement
[Updated Date] Power Platform – Information about SharePoint file thumbnail changes
Message ID: MC1454816 (Updated)
Beginning September 18, 2026, SharePoint triggers and actions that are currently returning a thumbnail URL are being updated. The new Get file thumbnail action will return an image instead of a URL, and existing flows that rely on the current thumbnail URL will otherwise return an invalid URL that may cause subsequent flow actions to fail.
How does this affect me?
Existing flows that use SharePoint triggers or actions such as Get items or Get file items and rely on the thumbnail URL dynamic content should be transitioned to use the new Get file thumbnail action. If flows and agents that rely on a returned URL are not updated to use the new Get file thumbnail action, subsequent actions that depend on that URL may fail.
What action do I need to take?
Update any existing flows and agents that use the thumbnail URL dynamic content to use the new Get file thumbnail action.
Source: Microsoft Message Center • Analysed by MWPro
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