Attempting to upload an app (using drag and drop) that contains a <screenshot> URL that returns a 404, will generate an error in the browser console (HTTP 400 in my case), but will not alert the user otherwise (the page shows that it's still processing the app).
fixed.
The importer now checks the screenshot urls and displays an error message on fail.
Will be online in the next marketplace release (next few days)
Attempting to upload an app (using drag and drop) that contains a
<screenshot>
URL that returns a 404, will generate an error in the browser console (HTTP 400 in my case), but will not alert the user otherwise (the page shows that it's still processing the app).