Decrypt files in external storage

Dear community,

i have a question about external storages:
I recently reconfigured my external storage (FTP on my local network).
While reconfiguring i accidentally checked the “Enable Encryption” checkbox.
I noticed this when trying to access the files directly on the FTP share without “going through nextcloud” if you understand what i mean.
After disabling the “Enable Encryption” chekcbox, all new files started being unencrypted again.

So I now have a network share where some files (those uploaded within the period in which encryption was enabled) are encrypted and all others are not.

What i would like to do is decrypt those files, so they can be accessed directly on the network share. Is there a nextcloud command to do so?

I’m running NC 17.0.5 as a snap on a Ubuntu server