That’s because we’re not fully supporting every element just yet when receiving back in Revit. This is partly due to the fact we haven’t yet written conversion routines, or because it’s not possible from the Revit API.
Here is a full list of supported elements: Supported Elements | Speckle Docs
To explain your errors a bit more:
- Skipped object of type System.String, not supported. => this element type is not supported yet by Speckle
- Missing type. Family: Muro di base Type: cordolo 40x40 cm, Type was replaced with: Basic Wall, Generico - 30 cm => the family existed but not the type, so it’s been replaced with another form the same category
Let me know if you need more clarifications, happy yo go through them 