"_data" for TransparentUpgradeableProxy?

Trying to deploy a TransparentUpgradeableProxy through remix on avalanche blockchain, which suits my needs.

Not sure what i'm supposed to input as _data parameter in order to deploy my contract, leaving it empty doesn't work. Any help please?

Hi @godking_bud, upgradeable contracts are not supported on Remix. Instead, you can use Hardhat or Truffle with the OpenZeppelin Upgrades Plugins.