Try to export Microsoft Edge bokmarks and settings manually. Open Edge and press CTRL+X. You will be reddirected tot eh settings menu. Choose “Export to File” option and decide its exact location of file with Edge bookmaks on your PC. The file is saved in HTML format. I have not imported such file to Opera, but I used it for Chrome already adn everything is working. As I know Opera also except external files with bookmarks to ruin them in browser. Follow this link to read more https://rocketfiles.com/articles/how-to-import-bookmarks-from-edge-to-google-chrome. I hope it will be useful for you as you can operate with such files as you wish.