Hi @javierz ,
Could you please share a bit more about your scenario?
Do you want to check if there are some files attached to the Attachment control in your Edit form?
If you want to check if there are some files attached to the Attachment control in your Edit form, I agree with @bboardman thought almost.
Currently, within PowerApps, there is no direct property supported in Attachments control to tell us that if there are attachments associated with it. As an alternative solution, you could consider take a try to count the amount of the files attached within the Attachments control.
On your side, please take a try with the following formula:
Set the Text proeprty of the Label control to following:
"Attachments Amount: " & CountRows(DataCardValue13.Attachments) /* <-- DataCardValue13 represents the Attachments control in my Edit form */
On your side, you should take a try with the following formula:
CountRows(YourAttachmentsControl.Attachments)
if the result above formula returns is more than 0, it means that there are attachments attached within the Attachments control in your Edit form.
Best regards,