Summary
When you migrate something from 1 project to another you have to restart UEFN for the assets to show including dependencies. This is so annoying and time consuming 
Please select what you are reporting on:
Unreal Editor for Fortnite
What Type of Bug are you experiencing?
Assets
Steps to Reproduce
Create a new asset in a project in modelling mode some type of mesh ie box
In the content browser right click the mesh you created-> migrate → pick a new project that has never had the asset
Expected Result
When you open that destination project from the same existing UEFN session (any project) it should be available and show
Observed Result
It isn’t available and doesn’t show until you restart UEFN
Platform(s)
pc
Additional Notes
If you add dependencies ie material’s textures ect it just all is mostly invisible. Fortnite referenced assets work tho which is weird. It does show the .uasset file in the explorer but its not visually available in the editor.