Hi @Sifu ,
If the attachment size is large, I recommend you to add a Delay below the trigger and use Get item action to get the detailed info of the item.

Please ensure you add attachments to an item when creating an item.
When processing some similar cases before, I found that if the size of the attachment is large, the item will be created first, and the attachment will be delayed for a period of time to upload successfully. Therefore, the attached information cannot be obtained in time after Flow is triggered.
Best Regards,