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Updating assignments

I am having a little problem with assignments.
I have set an assignment for students and ticked the ''Students begin with a copy of selected document"
I then realised the doc was incorrect/ needed updating/ changing/ tweaking.
I deleted the assignment, tweaked the doc, re-did the assignment, but some students continued to receive the untweaked doc.
This was from a full delete of the assignment. I have tried removing the doc and reattaching it in the assignment management but the changes don't trickle down to the students copy.
And as i write that I think I see the problem, they have a copy. Not the original.
I'm still unsure why scrapping and redoing the assignment didn't give the students a fresh copy though. I would like, I think ,an option where the students can be given a document, but submissions are on a new document, then there can be one source of truth?
Or am I missing something?
Comments
When you create an assignment using submission option 2, "Students begin with a copy of selected document," as soon as you publish the assignment, the document is shared with students (not copied). You can continue to update that document and students will immediately see the updates.
As soon as a student clicks "Start assignment," a copy of the document is made for them and no further updates from your end will be reflected because they are working in a copy.
You can create a new assignment with the same document and, just like before, changes in the document will be seen by the students until they click "Start assignment."