I know that you can get around this currently by pasting a gallery into a data card, but I've found that often the galleries don't display information when they're published with this method. When I create a floating gallery outside of a data card on the form (which looks awful) with the same Items property, it displays correctly. My specific situation is that I'm customizing a SharePoint form and want to display information in a gallery on the form, specifically on a part of the form that you have to scroll down to (sometimes I can use galleries at the top of forms, then hide them before scrolling is necessary). I'm not sure how else to place a gallery on the form and keep it in line with the other data cards. There should be a way for the galleries to be placed within the forms, act like data cards re: allignment, and function as expected.