over 4 years ago - Avanya - Direct link
I'm guessing we're talking about missing and failed assets reported by the Loading Screen Mod.

Missing are typically props or trees used to decorate buildings. These aren't needed for the buildings to work, but without them the buildings will not look exactly like in the screenshots. It's up to you if you want to fix these. Not having some props or trees can be a good idea to save some RAM usage. If you want to get some missing assets, the Loading Screen mod makes a handy list with links to the workshop pages - you can see where that report is saved (and change that) in Options and by finding the mod on the list on the left.

Failed assets are not working for some reason and these should be fixed. Sometimes they are buildings missing a network, that you should subscribe to for them to work, sometimes they are broken assets that should just be removed. Again the Loading Screen Mod report will show you what's wrong and if you can fix the problem.