Possibility to successfully add the new Site Page content type to a custom Wiki or Document library and improve functionality.
I love the layout of the new Site Page content type, with end-user friendly editing options, super easy and intuitive document and video embedding options and easier than ever picture inserting. It is perfect solution for when end-users (even not power users) have to author wiki pages in a SharePoint site. When inserting a picture, you do not need to choose in which library it will be uploaded and you don't have to fill any meta-data. The same with attaching documents. Even more - Office documents get automatically embedded in the page. Now you can have some text and embedded PowerPoint presentation together and ANY end-user is able to do this in just few moments.
HOWEVER, this functionality is ONLY available when clicking on gear and choosing to "Add a new page". When going directly to Site Pages or having a web-part of Site Pages and clicking on New, you still get the old site page edit layout.
Furthermore, when trying to add Site Page to custom document library or Wiki library (in SP Designed) and then trying to create a new page, it gets saved in Site Page library. No matter what. Tried copying site page from Site Pages library to custom document library with the same content type added, result was that the page was copied, but when opening it, it was empty. Tried creating a new site content type inheriting from Site Page, that did not help. Tried to fool SharePoint in all ways I could think off. Not possible.
In the end, we will not use this new site page layout, because we do not need end-users creating new pages in Site Page library, because they are not able to find them afterwards, we can not provide separate libraries for each department, team or project. Therefore we can not use specific library permissions, target audiences, and so on.
It looks and feels nice, but everything around this new update makes it useless. If this would be fixed, it would one of the best things for end-user experience.
Other things not working good:
* after saving the page does not show the title.
*It is not possible to view the canvas column in a list view, like it is possible to do with Wiki content column of Wiki page.