Hi @romankorchak1,
Have you solved your problem?
Do you want to check if a special id existing in the SP list and update it?
Could you please tell me if these columns are Text type?
1). Add a TextInput to input your special dynamically TempId, set its OnChange property as below:
If(IsBlank(LookUp(Product,TempId=TextInput14.Text)),NewForm(Form3),EditForm(Form3))
2). Add a Form and set the Item based on the TempId, if it exists, make it an edit form, if it not exits, make it a new form.
Set Form Item as below:
LookUp(Product,TempId=TextInput14.Text)
3). Add a submit button and set OnSelect as below:
SubmitForm(Form3)
Note that this solution helps you fill in dynamic TempId and update data dynamically.