Unfortunately, Asana does not notify external integrations of changes to custom fields in projects, so you'll need to refresh your data for Flowsana to pick those up. To do that, go to the Data Refresh page, and select the top refresh option, "Refresh project custom fields":
Another factor to keep in mind is whether the project is in a team that isn't currently included in Flowsana; if so, you'll want to add that team to Flowsana. To do that:
  1. In your Flowsana web portal, go to the My Account page.
  2.  In the Summary section, click this link: Image Placeholder
  3. Follow the prompts to connect your Asana account - make sure it's the correct account if you have multiple accounts.
  4. Next you'll see a list of those teams and workspaces that are currently NOT in Flowsana. Select any teams or workspaces that you want to add. Click Save and Continue.
  5. Wait for the email that your account has been set up. (In this case, it's just been updated; no work you did previously has been lost or overwritten.)
Your project and its custom fields should now be available in Flowsana.