There is no way to insert a hyperlink control in a repeating section for responsive forms.

Use List and Library GUID to lock onto the resource instead of display name or URL. Any changes to the display name break the form (and workflows) and should instead work similar to Flow where it locks onto objects with GUID.

Currently Nintex Forms for Office 365 form variables cannot connect to people picker columns. Please add this feature.

Provide support for Nintex Forms in Right to Left format like in the on prem products

Allow Nintex Forms customization for 'Picture' content type.

The Nintex forms designer throws this error if we modify Picture library:
Cannot use Nintex Forms for content type : Picture

Is there a way to enter "Help Links" that would link to external documents on Nintex forms?

SP modal popup or list view as control, this functionality is not available in Nintex form. We do have requirement to fill large data in different list using same form.in this case it helps most

support forms in picture libraries

When previewing a changed form in the designer there is no way to test the change with an existing list item (as is possible with InfoPath). Instead we have to Publish-and-See. The addition of this feature on InfoPath 2007, shortened form development considerably.
I think the same feature on Nintex forms would really help your form developers, too.
Otherwise, really, the Edit mode preview is only testing the display/edit/new mode rules - nothing else. A real waste.

I'd like the ability to define the height of a multi line of text control to be added.

Currently there are scroll bars quite quickly. Couldn't a functionality added similar to changing the width?

Please fix the issue with Responsive Form stripping HTML tags such as <br> in Rich Text control.

Currently if you embed a html table with <br> tags in a a Rich Text control, the tag is stripped when previewed however it looked fine in the canvas.

Showing mix messages that Nintex Responsive Form supports proper html during design mode but doesn't work as expected when the form is published.

If a form can no longer load due to a corruption or invalid information that works with rules. It will crash the designer session. It would be invaluable to be able to open the form in debug mode. This would allow the designer to remove the offending column or correct the rule.

Currently, a workaround is to delete columns that you know had rules or validation applied to them.

I would like to add a HTML table to the multiline text control

In the same way that the repeating section can serialize named controls into XML, allow the same for an entire form - so all named controls and repeating sections can be serialised and stored in a multi-line text field.

I know the parallel designing is not possible in Nintex Forms. Hence can we introduce a new functionality saying that this form is Checkout by so and so user, before the other user starts it work in the same form.

Currently Nintex Forms for O365 does not support any of the Digital Asset content types. This includes the out of the box Image, Audio, and Video SharePoint content types. It would be great to see that support added down the road.

We have a requirement to be able to add an attachment control into the repeating section.

This allows the user to add an attachment provide other metadata in that row.

Nintex Forms does not currently support a major type of data field - the Business Connectivity Services (BCS) External Data column. This allows users to lookup data in external databases from the form using the built-in SharePoint BCS interface.

This is a critical component for many business processes that need to tie to customers, products, suppliers, etc that are all maintained in external systems.