Saving of native previews
For now, all assets saved with Connecter's integration won't have a native preview. You can open and re-save them with Blender if you want to get one.
Managing external files
If material is missing in your scene, it can still be exported and will be visualized with a pink preview. For now, the integration doesn't handle these situations. We recommend running the "Find Missing Files" option from File -> External Data before adding assets to Connecter.
Saving materials from linked assets
Currently, if you use "Add Materials from selection" on a linked asset, it will work, but the saved files will have empty previews and won't represent the real materials. This is caused by a limitation in Blender and will be fixed in the future.