AssetBundle tutorial - ToastedOven/CustomEmotesAPI GitHub Wiki
As a prerequisite, you will need the AssetBundleBrowser extension installed into Unity.
Once installed, you can access it from the window tab:

After you have it open, simply drag your items you want into the window as so:

Line 1: The first asset, this will create the asset bundle itself.
Line 2: All future assets, this will put it into an already existing bundle.
After you have your bundle arranged, go to the Build tab and hit Build. This may take a minute depending on your CPU/Storage speed

Once it has finished building move your newly created asset bundle and place it in your project folder

In your project (I use VS, but you can use whatever), make sure to mark your new resource as Embedded
