You can't claim btg from coinbase, neither they give you access to private keys so your btg are lost.
And for first question try to import paper wallet's private key into coinomi.
Step By Step Guide On Claiming BitcoinCash from Mycelium Wallet
You can't claim btg from coinbase, neither they give you access to private keys so your btg are lost.
And for first question try to import paper wallet's private key into coinomi.