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Cannot publish due to not upgrade

Hi, cannot publish or say move my PLOTLY chart to web based version.
Get this error message To create folders, you need to upgrade your subscription. Upgrade your account to save folders, private files, and more: https://plot.ly/settings/subscription

which means I have to pay first then I can create the folder, then I can publish?
Saw some youtube videos, seems people can publish the chart even when they only have the free account.
Just wondering, is ‘pay’ is the only way which I can publish my chart or any instruction I can do to make publish happen with a free account?

Thank you!