Call such bugs in or we're going to be stuck with them. There may be some workaround but these makers deserve a call for each unit they produce with issues like this or poor documentation.
I've Just Purchased a Panasonic TX-50AX802B 4K TV and a Western Digital Element 2TB Hard drive. So I borrowed the hard drive to my friend because he as the same one and transferred all the music and films over to mine plugged the hard drive in to my television went to APPS on my remote and went to media player everything was on there that he had put on and all played, But there was files on there that I didn't want but could not delete the files through the television so I disconnected the hard drive from the tv and put it on my laptop found the device and I deleted all the files that I didn't want. Plugged it back in to my tv and the deleted files are still on there above each file it says recycle bin and when I open the file it now says file not supported any help would be much appreciated.