2? Click the Organize Pages option, click Insert Page (select Insert from File), and then select which signed and uneditable document to open?
3? Under the Insert Page option, after selecting Location:, select Page: Last Page, and then click OK?
4? Delete the new page and keep the inserted content so that it can be converted into an editable pdf document?
At this point, we can modify and edit the previously signed PDF document by clicking the Edit PDF option again.