I've been tweaking the recorded files section of the web page a bit as I was finding it a bit tedious to check the recordings just from the filename list.
The attachment shows where I have got so far. It gives a more tabular view with a thumbnail and a delete button for each recording. Clicking on the recording number brings up the full size player as before.
Thumbnails appear for recorded images and for videos recorded via motion detection as at the moment I am using the motion process to produce those.
The change requires replacing the preview.php file in /var/www, adding a couple of icon files, and making a couple of changes to motion.conf in /etc/motion.
Details for this and the files are at https://github.com/roberttidey/RaspiCam
This change can work with the python helper program but does not depend on it.
Couple of extra improvements added.
Proper thumbnails generated for Image files to avoid downloading large files.
Thumbnails generated even for manually recorded material.
The extra thumbnail generation is done using ffmpeg and is currently done on the fly for any new material that doesn't have a thumbnail so it can cause a delay of a few seconds when switching into the download list. Once any new thumbnails are generated then switching is faster.