After editing all of the assignments, i made a mistake and imported assignments from a previous year and i lost all the work i had done in editing the current year.
is there a way to retrieve my work?
There may be a chance that your work was "archived" in your beta or test space. [yourinstitution].beta.instructure.com may have a copy of your initial material that you can download (How do I export a Canvas course?) and then import into your current class (How do I import a Canvas course export package?)
Your local Canvas Support may be able to help you do this as well.
Once you have some time to explore this option, please reply and let the Canvas Community know what you learned.
Retrieving data ...