Thanks for your feedback. You must change the imports of the uploaded files to Etherscan from e.g. `import "../../GSN/Context.sol"` to `import "./Context.sol"` since they are now all in the same folder on Etherscan. If you do that properly Etherscan will verify your contract.
In our case this means:
- `import "./Context.sol"` (in ERC20.sol)
- `import "./SafeMath.sol"` (in ERC20.sol)
- `import "./ERC20.sol"` (in TestERC20Contract.sol)