@JorgeTena

The easiest and recommended way to handle file attachments in Pega Constellation is to use the built-in Attachments component in your form instead of creating a custom page property. This component already handles uploads and links them to the case. To limit the file size to 2MB, go to App Studio > Settings > File Upload Settings and set the maximum allowed size there. If you need to validate the file size after upload, you can check the .pyFileSize property from the attachments list using .pyAttachments() or a data page like D_AttachmentList. Pega fills in the file size only after the upload is complete, so don’t expect it to be populated before that. If you still want to use your custom property, you’ll need to manually extract the file info after upload using a data transform. But using the out-of-the-box attachment feature is much simpler and works best with Constellation.