Perhaps I mistakenly selected one I’d never want to use? By clicking on the Component, we see in Properties that the Related List is correctly trying to pull in Files. Until you click on the Related List Component, from this message you can’t actually tell what Related List we intended. Quick Sanity Check of the Related List Properties In part because it is not clear what it is telling me, and in part to be thorough, I’ll click on the Related List Component in question and give a quick once over on its Properties. Once there I look at the Files Tab and see a message stating “This related list cannot be displayed because it is not in the current page layout.” This somewhat cryptic message indicates that the Related List in question is not on the Page Layout in Classic. The Gear which gives access to Setup also gives an easy back door to open this exact Lightning Page Layout in Lightning App Builder. To investigate further, as a System Administrator I edit the Page in Lightning App Builder. Investigate Page Layout using Lightning App Builder In looking under the hood we’ll discover that the Component cannot be displayed. To the end user it looks like I simply forgot to put something on that Tab. In the Lead below, clicking on the Files tab reveals a blank space instead of a list of Files. You put the Component on the page in Lightning App Builder, only to find it is missing when you check on an actual record. When building Lightning Page Layouts, you may encounter a Lightning Component that appears blank.
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