Does Plumsail forms for SharePoint online fully support Managed Metadata fields.
Does it display a managed metadata field?
Does it allow you to choose a term from the managed metadata term picker and save it to the list?
Does it allow you to add a new term to the term set from the form?
Dear @Visuary,
Sorry for the delay! Answer to all your questions is: YES!
All of this is supported, here's how the dialog box for Taxonomy (Managed Metadata) looks like: