One of my faculty members just inadvertently wiped *all* her active courses while importing a course from commons. She saw "All Courses" as a destination option and read it as "All Content", which is the import language from the standard import content page. Easy mistake to make, but it can't be undone.
Canvas should confirm the user really wants to overwrite all the content from all the courses, rather than just adding content to a single course. A popup would be very helpful for avoiding this issue, in addition to the undo feature which has already been suggested and added to this theme: https://community.canvaslms.com/t5/Canvas-Ideas/Course-Import-Export-See-Detailed-List-of-Course-Imp...
