To users of KDE I bring you a way to solve that annoying message when we try to trash a file and it does not leave us Dolphin which shows us a message similar to this:
One way to solve this problem is by emptying the trash by hand as indicated in the message, but it is uncomfortable or we may not have the time to check if a file should be saved to delete it permanently.
The other way that this message is not displayed every time the trash is full is the following:
In this section we can edit if we want to set a maximum size for the trash, delete the elements when it reaches the top, etc. In my case, the trash can is configured not to have a maximum limit.
Well that's it, I hope it's useful. Cheers!