Can anyone tell me to file the assignment or submit it by tying it to a thread?

Unfortunately, I do not have enough context to fully understand your query about filing or submitting assignments by "tying it to a thread". 

However, based on a literal interpretation, here are a few potential perspectives:

1) Physical submission:

Most universities require students to submit hard copy assignments either in person or by post/courier. In this case, "tying it to a thread" may refer to binding the assignment pages together with a thread for submission. However, this seems like an unconventional method.

2) Online submission: 

If your university has an online assignment submission portal, then "tying to a thread" may metaphorically mean attaching or uploading the assignment file to a particular section/thread on the portal. But this phrasing is unclear.

3) Discussion forum:

Sometimes students discuss assignment questions on online forums. "Tying to a thread" could mean posting your assignment queries or answers as replies in a particular forum thread. But this is generally discouraged by universities.

Without more details about your specific university's assignment submission process and policies, it's difficult for me to provide accurate guidance on what "tying to a thread" implies in your context.

I would suggest checking your university's official guidelines, contacting the concerned department, or your student counselor to understand the proper procedure and accepted methods for submitting assignments per your program's requirements.

Please feel free to provide any additional context about your query, and I'll try to assist you further.