I am a intern working for a telecommunications company who is looking to migrate arcmap files and migrating them to arcgis online. We are currently trying to figure out how to customize pop ups in arcgis online. I have done some research and it looks like it may involve a combination of html and Arcade, but I do not know how to access the html code for the pop up.
We are also trying to figure out how to simplify the pop up when it has multiple items that need referencing. For example, a pop up that will refer to photos, work orders, etc...