Just share the thoughts:
Was this web app at Online originally published by your Pro?
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To test if Pro can be used to update the existing web app hosted at the Portal /Online, I may try the following steps:
- author and publish a web app within Pro;
- update this existing content of web map in Pro, when needed; and then
- restart/ refresh the web app within Pro / Online.
Maybe, it shouldn’t be republished/ overwritten…
Currently, it looks that web apps can be published via ArcGIS Portal/ Online, WebAppBuilder, or ArcGIS Pro. So far, I don’t see the seamless update of the web app, which is published from above one first, and then can be overwritten by other…