Hello Peter,
Please, upgrade your AB copy. We reach the 190 app samples with the current release, one of these, the new WYSIWYG app sample. This app sample uses SummerNote to provide a WYSIWYG editor to our apps, and, shown how we can initialize it with some specific contents, and how to retrieve the contents from the editor, in order to be uploaded to the app's server, for example.
In fact, we go a little beyond with this app sample. Let me to explain a bit. In the sample that I prepare for you above, and, in order to allow me to copy it here as XML, we use the SummerNote script and style from a thirdparty server, that is, we use URLs to retrieve, link and use these required files. When I start to prepare the sample to be included in App Builder, I note that the style file requires by itself a couple of font files.
The above represent a problem, because, we can use the app's file manager to specify an app's local script and style, but, then these files are placed into the "app/scripts/" and "app/styles/" folders, and, in the case of the SummerNote style, can't find the appropriate font files in the expected place, so the editor cannot be properly initialized nor used.
To avoid the above problem, the current release of AB allows to specify app's relative paths using the app's file manager. So, as you can see in the new WYSIWYG app sample, what we do is to use the file manager "Folder" tab, in order to include the entire "summercode" directory. Then, we specify app's relative paths for the required style and script, and, now yes, all works as expected, since all the required font files (for example) exists in the place that the SummerNote expected.
Probably you reach the described problem if you start to use local files for SummerNote (which probably it's quite recommended, since it's perfectly possible, easy to do (right now) and do not depend on any server), so I hope the introduced changes are good for you and others too.