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Why do thumbnail links for images in Sharepoint become broken after a day?

When an image is saved in SharePoint, I post the image thumbnail to Teams


Post a Flow Bot to Teams using "Thumbnail Large" as shown in the following figure.


Each time a file is created in Sharepoint, a message is posted to Teams.



But when I looked at the same post on Teams a day later, I couldn't see the thumbnail image.


Do thumbnail links cause broken links after a day? If you have a solution, please let me know.

*Of course I have confirmed that the original files are on SharePoint.




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