Metadata of Album displays 'Unknown' (although in tag other)

[midoldie]

Hi,

Probably I am missing something...
I can see in now playing song window (and send to Tasker) all other existing metadata from file (Artist, Trackname, Year, TrackNo, etc..), but 'Album' remains 'Unknown' . Although there is value in the Tag. Soon as I edit 'Album' in GMP Tag editor, 'Album' gets Displayed in player (and received with new value in Tasker). 
Might anyone can help how to get the Album displayed from original Metadata?

Br,
Mid

[GoneMAD]

your tags are not correct or do not conform to the id3 spec. Use a tool like mp3tag to properly tag your music www.mp3tag.de/en/

[midoldie]

Thanks for quick reply! Yes, I'm longtime mp3tag(from www.mp3tag.de/en/) user (and just in case, all the other tags except Album showing fine)
Removed the Album with mp3tag tag, saved and added Album there again. Loaded the file back to phone but GMP still showed Album 'Unknown'. And again, soon as when I edited album value with GMP's tag editor, value started to show right in GMP

[GoneMAD]

copy the file to a different location.. if you straight up replace the file it is likely viewing a cached copy, or just be sure the "last modified time" of the file is different. Thats what gmmp looks at to determine if a file has changed

[midoldie]

Ok, thanks, did that now (cleared also the cache), but unfortunately no changes. Maybe reinstall would be next option?

[GoneMAD]

no i would guess whatever you are using to transfer the files to your device are modifying the tags or you are not correctly tagging them with mp3tag. Play one of the songs with an issue and click the song info button in now playing.. it lists the tags read straight from the file. GMMP uses taglib taglib.org/ and whatever mp3tag reads / writes, so can taglib

[midoldie]

Yes, clicking to info button shows the Tag well (with right info). But when I under Displayed Album metadata it is 'Unknown'.  (Other metadata is ok under info& Displayed metadata).
I transfer the files to phone through cloud (Tried to transfer now also some albums through cable, but result is sadly same (with different albums)).

But anyway, thanks for your replies, (strange, tried with 1 very old tool - massid3lib.sourceforge.net/home2.html and got currently 'Album' showing correctly somehow now)