Hi and welcome!
Would you be able to share some more details about exactly what steps work and what steps break down? Perhaps a screenshot might be helpful as well.
Special characters shouldn't be any issue, regardless of where they appear.
A manual import can also be performed by performing a regular export from the Master Password application and using the "Share" option:
You can then select the Spectre app as the application to share the export with.
Note that you can also contact firstname.lastname@example.org for private personal support with any issues.