Thank you! Removing Parent.Default on Attachments worked for my form that was showing old attachments. I also had other fields showing old data. The problem started for me when I published the form in Edit Mode with existing data. If you remove the Parent.Default from other fields they will not save back to SharePoint. To fix the caching issue, I had to change the default mode of the form to "New" and clear all the data out before publishing again.
I have read through this entire thread and still have the issue. I will reiterate the issue:
I have a Powerapp displayed on a SharePoint page and fill out the form. All fields show as blank as it's a New form. I submit the form and have another screen with a button to "Submit another form".
That button has a formula Resetform(form1);newform(form1);navigate(form1screen).
This resets/creates new form except for displaying an attachment in the attachment field. This attachment is the one submitted on the first item in the list, not even the one I just submitted.
I have changed items from Parent.Default to ThisItem.Attachments but that doesn't work either.
I have the same issue and have been waiting for some resolution.
Meanwhile, I have restored the very 1st test item I had created in this list and kept it in the list with attachment field blank.
This provided a Band-Aid solution and my new form does not show attachments anymore.
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