Thank you for reaching out to Microsoft Q&A forum
After reviewing your information and conducting some research, my initial assessment of this issue is that the cause may stem from feature gap in Microsoft 365 rather than a configuration or propagation problem.
Microsoft SharePoint allows administrators to create Organization Asset Libraries of two types as stated in Create an organization assets library:
- ImageDocumentLibrary – for storing images such as logos and photos.
- OfficeTemplateLibrary – for storing Office templates (Word, Excel, PowerPoint).
As far as I know, while OfficeTemplateLibrary is fully integrated with Office desktop applications (Word, Excel, PowerPoint), enabling users to access templates directly from the “Your Organization” tab, the ImageDocumentLibrary is only supported in SharePoint Online. Specifically, images from this library appear in the SharePoint modern file picker when adding web parts to pages, but they do not appear in the “Online Pictures → Your Organization” option in Office desktop clients.
Therefore, Office desktop apps currently do not have built-in integration to fetch images from ImageDocumentLibrary and the “Your Organization” option for images is implemented only in SharePoint Online’s modern file picker.
So, since direct integration is not supported today, you can try some practical alternatives:
1. Sync the Image Library via OneDrive
Use the OneDrive sync client to sync the SharePoint ImageDocumentLibrary to users’ local machines.
- In Office desktop apps, insert images via Insert → Pictures → This Device from the synced folder.
2. Publish Images to a CDN or Company Portal
Enable SharePoint CDN or use Azure Blob Storage to host branding images.
- Provide a centralized URL for employees to access images.
3. Develop a Custom Office Add-in
- Build an Office Add-in using Office.js and Microsoft Graph to fetch images from SharePoint.
- Integrate a branded image picker directly into Word, Excel, and PowerPoint.
Hope my answer will help you, for any further concern, kindly let me know in the comment section.
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