Question regarding dropbox

Good evening, Misbahul Chowdhury Welcome to the Canvas Community.  Thank you for posting your question.  Canvas does not have a "Dropbox".  This terminology might be used in other LMSs, but not in Canvas.  You can submit multiple files to one assignment in your Canvas course, however.  Please check out this Guide: How do I upload a file as an assignment submission in Canvas?  Check out the illustration under the heading "Add Another File" (about half-way down that page).

I hope this information will be of help to you, Misbahul.  Please let Community members know if you have any other questions about this...thanks!