Hello @VishalDarkunde!
This issue has popped up from time to time across the community. Since you recently migrated your level, it could mean the materials and/or textures failed to hook up to their targets. Let’s try the following:
- Open the migrated level, and make sure that shaders have fully compiled (Window > Developer Tools > Shader Compile Stats)
- Check one mesh in the Details panel, and confirm what material is set. If it’s “DefaultMaterial”, you a broken references there
- Re-run the migration, but this time point it to a fresh folder inside Content (for example, Content/MigratedTest/). This will avoid conflicts with existing folders
- After the new migration is complete, delete folders /Saved and /DerivedDataCache in the target project, re-open, and let shaders rebuild again
- If elements are still black, open one of the migrated materials, then re-assign a texture manually to confirm textures came across correctly
For further details, and other possible resolution methods to test in your scenario, please check the threads below: