I wonder if that’s where you are running into a problem. That may be a question for glide support to get clarification. I’ve never been completely clear on the differences between legacy and current plans and what you can and cannot do…and I’m not sure if it’s documented in detail anywhere. I do know that some things are kind of restricted if you are still on a legacy plan.
Glide Support link:
https://glide-help.zendesk.com/hc/en-us/requests/new
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