Limit the size of file attachments in a feature class in ArcGIS Pro

Summary

In ArcGIS Pro, file attachments, such as documents and images, can be added to feature classes. They are stored in a geodatabase feature class attachment table and linked to individual features. Refer to ArcGIS Pro: Add or remove file attachments for more information.

This article provides the workflow to limit the size of file attachments in a feature class in ArcGIS Pro. This method is useful when limiting the size of attachments, for example images, for newly created features on a map.

Procedure

1. Open the ArcGIS Pro project.
2. Enable attachments for the feature class.
3. In the Catalog pane, expand Databases and the feature class geodatabase.
4. Right-click the feature class attachment table and click Data Design > Attribute Rules to open the Attribute Rules view.
5. Add a constraint rule to the attachment table.
   1. In the Attribute Rules view, on the Constraint tab, click Add Rule.
   2. In the details pane of the rule, specify a name for Rule Name.
   3. Specify a description of the rule for Description.
   4. Click the Expression icon to open the Expression Builder window.

5. In the Expression Builder window, in the expression box, type the following expression. Replace <dataSizeField> with the name of the data size field in the attachment table, and replace <dataSize> with the maximum size of data (in bytes) for attachments in the feature layer.

if ($feature.<dataSizeField> > <dataSize>) return false;
return true;

if ($feature.DATA_SIZE > 2000000) return false;
return true;

Note:
The units of the data size field in the attachment table is in bytes. For example, a value of 2,000,000 is equal to 2MB.

6. Click the Verify icon to verify the expression, and click OK.
7. In the details pane of the rule, specify a number for Error Number, and specify a message for Error Message.
8. Check the Insert check box under Triggers.

6. On the top ribbon, click Save.

The image below shows an error message returned when adding an attachment to a feature if the file size is larger than the limit specified in the constraint rule.