I don’t claim to fully understand, but I doubt there is any Anvil limit on what you can display in an iFrame. I suspect the issue is similar to others you’ve reported, some kind of timeout in the connection between Colab and Anvil. Do you get the same issues if you run the Uplink code on your local machine, where you have more control of what’s going on? Otherwise, providing more details (like a clone link) might help others better diagnose with you.