If you export a Cosigner Public or Private Key using the specialized buttons, you're only allowed to "share as ur:crypto-hdkey" or "print" (the UR) or share the QR (or the UR).
If you "Derive Key"->"Other Key Derivation" for any Derivation, including Cosigner, you're given an extra option of "Share as Base58".
The "Share as Base58" option should be added to the individual Cosigner Public & Private Key buttons for consistency (and generally, I'd suggest just use the same page if possible, because other less important things, such as the developer-test buttons, are also missing.
If you export a Cosigner Public or Private Key using the specialized buttons, you're only allowed to "share as ur:crypto-hdkey" or "print" (the UR) or share the QR (or the UR).
If you "Derive Key"->"Other Key Derivation" for any Derivation, including Cosigner, you're given an extra option of "Share as Base58".
The "Share as Base58" option should be added to the individual Cosigner Public & Private Key buttons for consistency (and generally, I'd suggest just use the same page if possible, because other less important things, such as the developer-test buttons, are also missing.