hi Randy,
I am trying to create a new record every time the user click the submit button instead of updating the existing record for traceability. I dont think submit form can create a new record for me.
The screenshot below shows my original formula before I added the combobox for the multi-select column. It was able to create a new record and upload the new attachments without error. After I added the combobox it gave me the error as shown in the picture.

Then I tried to change the patch formula and manually type in every field/datacardvalue, that works for the combobox for the multi-select column, but I will getting an error when I add {Attachments: Datacardvalue.attachments} to the formula.
The formula below is what I have that works with the multi-select column but not with attachments.
Patch('Design', Defaults(' Design'), {PN: DataCardValue1.Text}, {Rev: DataCardValue2.Text}, {TestMethod: ComboBox1.SelectedItems}, {Comment: DataCardValue3.Text})
Adding attachments at the end like this gives me an error in the formula:
Patch('Design', Defaults(' Design'), {PN: DataCardValue1.Text}, {Rev: DataCardValue2.Text}, {TestMethod: ComboBox1.SelectedItems}, {Comment: DataCardValue3.Text}, {Attachments: DataCardValue4.Attachments)