Edited slider add image not working

Hi guys,

First of all thanks to the creator of plugin as it is really nice…

I have a strange issue… It happened couple of times and I do not know why…

After installing the plugin it seemed it’s working… I’ve created couple of slides and it was OK… After a while I wanted to add some image to one of slides and it was not showing up… I have deleted slider and start creating it from scratch and everything was fine… But, again at some point when I wanted to edit the slide and add an image… this new added image was not showing in the slide…

I can’t say when and why it happens so pls if someone had this issue I’d appreciate a lot for some help…

https://wordpress.org/plugins/crelly-slider/