Uploading a portfolio to an external ESG data provider’s online platform most likely shows a portfolio's environmental exposure. These platforms offer detailed insights into how the portfolio is exposed to various ESG risks and opportunities.

Environmental Exposure Analysis: By uploading the portfolio, investors can receive an analysis of the environmental impact of their holdings, including carbon footprint, energy usage, and other environmental metrics.

Data Visualization and Reporting: ESG platforms provide tools to visualize and report on the environmental performance of the portfolio. This includes charts, graphs, and detailed reports that highlight key areas of environmental exposure.

Benchmarking and Comparisons: The platform allows investors to benchmark their portfolio’s environmental performance against industry standards and peer groups, providing context and identifying areas for improvement.