I have numerous thumbnails for my web apps and web maps and as of this morning, they no longer have any? I also go into each item and double check and yep, there are no thumbnails associated with them any longer. Some sort of AGOL update?
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Update. 5 minutes layer, they just all reappeared. Thanks ESRI.
Update. 5 minutes layer, they just all reappeared. Thanks ESRI.