I am starting to edit videos in Kdenlive but I have a doubt with the water frames.

I just created a water frame with effects but the problem is that I can't use it in my videos because it is saved with a black background.

I leave an example of a video that I edited ... and where you can see the water frame at the bottom, I need to apply that water frame on all the videos without having to edit from scratch.

https://imgur.com/a/Mo8fcsL

Thank you very much

Please try with the current Kdenlive AppImage version 19.08.3b. Does the watermark clip contain an alpha channel? If so create a new video track on the top and put the watermark clip on thts upmost video track and render the video again.