Audio library not updated after adding files
VLC 2.5.7 ARMv7 Android 7.0
I have some audio files which I copied to the phone external SD card through USB from a PC and VLC could see and play them. They do appear in the lists Artists, Albums, Songs, etc.
Then later on I added some other audio files (OGG, MP3 and MP4), still through USB, into the same folder as the previous ones but they don't show at all in the lists I've mentionned above. The Refresh feature has no effect. In Settings -> Apps I have deleted the cache, then refreshed again, but without any success.
However I can see and play the files from the VLC built-in browser (Directories) and once they have been played they appear in the VLC History list. But still not in Artists, Albums, Songs, etc.
Attached first two screenshots are showing the files in the browser and the last screenshot is showing they are missing: The Opposition, The Who, Yes are not there.
Also notice that in the browser some files are seen with their extension while some other ones are showing the tags, even though they are the same type and they are all properly tagged, e.g. The Police and The Who are all OGG files. But the files showing the tags are the 'older' ones whilst the files showing the extension are the new added ones, doesn't matter their extensions.