v1 and v2 are different systems. This export tool makes a best effort to convert your flow, but some blocks or behavior may not carry over exactly (or at all).
Automated exports are just a starting point. You are expected to conduct a manual review and will need to make manual fixes after import.
You can export flows from v1 using the 3 dot menu in the flow editor, then "Export to v2."
Follow the prompts to download the flow file, then upload it from the v2 Components page.