Add configuration options for import

**Problem**
When working with data, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

No files, entry points, or tests are named. Start by locating the import configuration and existing error-handling paths, then clarify which options and error cases are required; done should mean the agreed import options work and failures provide detailed, useful messages.

Written by the indexing model from the issue text.