one form for edit and new - is it possible?

Hello, have a question - stuck with the following dilemma:
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HOW to use one form and one Event for two actions - add new record and edit existing record?
I can either add new or edit existing record😟
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My steps so far:
1) Created {fn:read_submission} with condition Submission.aid={data:aid}
2) created CF6 form with

1. Hidden field - aid
2. defined field names so all they have one Model - Submission[Name];
3. added field Value - {var:read_submission.Submission.Name}

3) created button that adds record - add_button with Event "edit"; URL and/or URL parameters - empty; Submit button? unchecked;
4) created link that edits existing record - submission_edit_link with Event "edit"; URL and/or URL parameters - aid={var:submissions_list.row.Submission.aid}
5) created edit event with

1. {fn:read_submission}
2. {view:submission_form} - this call CF6 with {chronoform/section:juridiskas-labot/load} and save Toolbar button [ step 8) ]

6) created save function {fn:save_submission} with Data provider: {data:Submission}
7) created save event with

1. {fn:save_submission}
2. {redirect:index}

8) created edit_toolbar_save Toolbar button with Event save; Submit button? Checked; URL and/or URL parameters - empty;
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And result is as follows:
1. when I put Update condition Submission.aid={data:aid} Edit record works/ Save new record - does not;
2. If I delete that Update condition, I am able to save New record and get duplicated record on edit;
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What have I missed here?
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Thank you in advance-
Elita

Or you could (and should, really) just have two events.

that was my first thought, healyhatman, but then, by analyzing Demo form Max created I noticed he used only one form. I am lazy by the nature - so tried to follow his approach😀

One FORM is fine, sorry I thought you meant one EVENT

.... and one event. too.
I use one Save event and one form for both actions - Add new and Edit existing - you can achieve that by adding Model to the field - that I "dug out" of the Demo form Max creatded - add Model[field name] and then on save use that Model as Data provider. Very convenient.