you need to set a few things @Traktion
the way iv been doing it is make a wallet in metamask for your hot wallet then inside meta mask get the private key for the hot wallet.
then open your .bashrc and add these lines to make it work
# incase your fingers type safe atomaticaly
alias safe=/home/$USER/.local/bin/autonomi
# network and wallet details
export EVM_NETWORK=arbitrum-sepolia
export SECRET_KEY=<privatekeyfrommetamaskwallet>
restart the window and thats you done upload as normal 
also if you need some funds for testing just say the word 