Manually iniitate recreating of image thumbnails

[mptpro]

Maybe this is already possible, but I couldn't find a way to do it.

I have change some of the image files on my the hard drive where Zipline stores them, but the thumbnails still shows the original image. What I do is manually add a new image to the "upload" folder and change the name of the new file to the one I want to replace.

Reason for this...

I have a training wiki, and I have a lot of screenshots that I display there. Each week I need to update a few of these screenshots with new information. I've long looked for an image hosting solution that would allow me to replace the original screenshot file, and thus display the new screenshot on my wiki without having to update all the URLs.

I've tested this with Zipline and it works perfectly! Except that when I replace the image files the thumbnails don't update to the new image.

Thank you.