Calculate and Stop Attachment(s) When The Size of Attachment is More than a default Size

[BHK]

Using ArcGIS Pro 2.7.1and having a simple Point feature class in GDB (schools) enabled for Attachment, I am trying to stop and prompt error message when user attached a big size images into the feature class.

I created a Field called `Attach_Size` in the School feature class and assigned a Calculation (Add Immediate Calculation Rule) to apply the code

 If(Count(Attachments($feature)) > 0) {
      return Attachments(size)
  }   

But this is not returning any thing either when creating a new feature or editing  existing feature. Can you please let me know what I am missing here?

Thanks

[HusseinNasser2 · Accepted solution]

So you want to add a constraint rule on the attachment table that says something like this

if ($feature.DATA_SIZE > 1000) return false;
return true;

[BHK]

Thanks Hussein, This is exactly what I was looking for