How to make imported data editable?

Question

Google

With the help of IMPORTRANGE I create a copy of the table for the purpose of editing. When editing a cell, the entire copy crashes. The array is not output as this would overwrite the data in the edited cell. For the same reason, I can't use copy when pasting into a site widget. The original is edited by users and changes are needed online. At the same time, it is necessary to correct and process the data in the copy (adding, deleting, filtering). What can't be resolved. Help find a way out. Thank you.