'GPG - import a .key file containing only the private key in gpg

I am trying to restore my backup but somehow the pubring file does only show 1 key pair.

I did import my old(most important) public key from the key server.

So far, so good.

Now I have a lot of keys inside ~/.gnupg/private-keys-v1.d/

They are all named "longcombinationOfLettersAndNumbers.key"

Can I somehow use these private keys to decrypt my backup?

I tried

gpg --import < fileOfAKey.key

but I get:

gpg: no valid OpenPGP data found.

Any tips/help appreciated.

import key private gnupg pgp

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