Delete from the web interface
In Camera Basic Settings dialog check Allow deleting files, reload the web page and click the trash icon of the unwanted files.
Delete multiple continuous recording files
Call View - Browse Files, it will open the directory location with all the recordings. Delete the files starting with rec_ which you do not want anymore.
Delete multiple detection files
Call View - Browse Files, it will open the directory location with all the detections. Delete the files starting with det_ which you do not want anymore (for each detection event there are usually two files: a small video in .gif format and a corresponding full video in .mp4 or .avi format).
Delete multiple snapshot files
Call View - Browse Files, it will open the directory location with all the snapshots. Delete the files starting with shot_ or manualshot_ which you do not want anymore.
Note: each time that files are deleted the web page is updated as soon as the browser's reload button is pressed.