STL subtitle file not recognized after installing STL plugin

Hello, I posted this question in this thread    Stl file in Trados file type not recognised  

After I consider better to start a new one.

I have stl files from a client. I installed both plugin for STL and Studio Subtitling. I restarted Studio after (three times) and the formats appear on the list of type of files. But Studio asks for a translatable file.

Thanks for your help. 

Studio 2021, btw.

Trados Studio error message saying 'The project must include at least one translatable file.' with an 'Accept' button.

Trados Studio file types list showing STL (Spruce) with extension '.stl' and STL v1.1.0.0 selected.

Generated Image Alt-Text
[edited by: Trados AI at 11:05 AM (GMT 0) on 4 Mar 2024]