Hello,
I am working on an Attachment Viewer instant app to showcase art pieces in our municipality.
I'm trying to make the attribute information a bit more plain text and less tabular. I would like to add a description for these as well, without having to add a really huge description text field in the attribute table for the data.
Looks like the Town of Gilbert in Arizona was able to accomplish this in their Future Development Attachment Viewer seen here:
https://tog.maps.arcgis.com/apps/instant/attachmentviewer/index.html?appid=b7490ff2d19b4dbabe8f79a126399039
Compare that to a screenshot of mine which is stuck just showing the attribute table in tabular layout. 
Any idea how they accomplished this? They even have different font sizes in their attachment information as well.
How I created mine was a feature layer of art locations with attachments set up in ArcGIS Pro, published to ArcGIS Online and configured in MapViewer as a webmap. Maybe I need to have this set up a different way?