For those of you that cannot get the recycle bin to work, there is an issue right now that I see in 6.5 and 6.6 that keep the recycle bin from working properly. It may be that this issue applies to 6.4 also.
It seems that some changes were made in Unraid along the line that prevent the recycle bin parameters from getting applied when changes are made in the plugin parameters. The recycle bin will be applied when the array is started, but changes in the plugin parameters will not get applied from the plugin webpage. For the moment, you will have to stop and restart the server to get the recycle bin parameter changes applied. This also applies to starting and stopping the recycle bin from the webpage. I will be working with LT on solving this issue.