In desktop Mathematica:
image = Thumbnail[ExampleData[#]] & /@ RandomSample[ExampleData["TestImage"], 3];
pos = CityData[#, "Coordinates"] & /@ {Entity["City", {"Hefei", "Anhui", "China"}], Entity["City", {"Lasa", "Xizang", "China"}], Entity["City", {"Xiamen", "Fujian", "China"}]};
GeoGraphics[{Red, PointSize[.01], Tooltip @@@ Transpose[{Point /@ GeoPosition /@ pos, image}]}, GeoRange -> Entity["Country", "China"]]
CloudDeploy[%, Permissions -> "Public"]
CloudObject["https://www.wolframcloud.com/objects/ec5ca71e-1c0f-487b-\ 963c-7e226e8fb914"]
Open the URL in browser it can't interactive:
Export["test.wl", %%]
Then in develop.wolframcloud.com/app,import the test.wl:
You see,it also can't interactive...
But Tooltip with text actually can work here.
How to fix it?
Reference:Exporting Tooltip data to HTML
PS:Even in local machine,it can not display image via Tooltip.
Export["test.html", %]



Appearance, such as a palette button or an action menu (since it uses the palette background). Same with group openers in notebooks. Also many of the little icons on structures likeDatabinjust aren't there, or weren't a month ago. They're probably all coming, but Mathematica is massive and the cloud has enough other kinks and bugs to make this not a priority. – b3m2a1 Jun 29 '17 at 13:45