Can a Complete or Solved or Closed flag be added to a thread?
dts, dts, dtsi are all extension that should be allowed for file attachments.
Regards
Hi @gpcus
Users can flag 
their topics and request a topic closure if they feel they are satisfied with the comments or answers.
We will be able to close topics for you.
Here is a message you can use to notify us:
Thanks again for the input.
Best,
Naveen
You should be able to add a .zip files, so I suggest you add a single attachment with all relevant files.
Cathal
Update to this thread - To make things easier for users we have added a solution check mark under " show more" option in posts. Topic owners can now mark a reply as solution if satisfied with the answers.