All my ISO files are corrupted.

[NKuch]

I have moved all my UHD ISO movies from a single HD to my Synologi NAS.
After this move - all my movies are "corruptet" and won´t play.

More info:

I have a Synology NAS DS918+ that I use for mig home theater. (4k ISO Collection)
It is connectet thrue cable (Cat 6)

My mediaplayer a Zidoo Z1000 pro reads the files, but can´t play them.
The Zidoo reads "Can´t play file".

Almost all my 4K movies are now shown in the display as BD and the data is in-correct.
The Last Duel 4K shown as BD with no icons. (Se picture)

Before the NAS I had a HD in the Zidoo with the same files, with no problem.

When I rip new movies there are no problem.

Can i fix the files or do i need to start alle over (+100 UHD movies)
Any ideas for soulotion?

Nas: Has 8tb + 8tb + 16tb (8GB RAM and SSD Cach)
(WD NAS RED disks)
(Internet is fast)

[dcoke22]

Do you still have your files on the single hard drive you copied them from?

[ArArdin]

I still have a Zidoo Z9X and I can confirm it is not handling every ISO properly. Every now and then I get this exact same "Can't play video" screen. Because the files play ok on other players, I think it's a Zidoo issue. Their machines suffer by everlasting updates during some seemingly unsolvable firmware conundrum. Where sometimes old, once-solved issues are re-introduced.
A "movie only" remux often will work with my Z9X.

edit: FYI I have my files shared on several servers, including Synology.

[ben_uk]

Does the NAS drive have built-in encryption? Could it be that the files have been encrypted in some form>?