On a Windows 10 PC I’ve been trying to import a WordPress website into 5.3.1 using the How to Import a WordPress Site into Local instructions. The zipped wp-content folder and the .sql file are in the same directory on the local drive. I’ve tried both the drag-and-drop and import methods with the same error. The import fails with a “Uh-oh! Unable to import site” error. I would appreciate any suggestions.
The wp-content directory and sql should be in a single ZIP, so you’ll need to unzip the wp-content zip in your screenshot. Put that and your .sql into a new folder and zip that new folder.