Attachment limit Sendgrid Inbound Parse (Free Trial)

I am working on a backend with Nodejs that uses a sendgrid inbound parse webhook to retrieve emails sent to my domain. I have everything set up and it works as it should. I can send emails to my domain and process them with the webhook. My problem is that if I send an email with an attachment larger than 500kb, the webhook does not process that email (does not retrieve it). I looked in the documentation, but I didn’t find any information about the maximum size of attachments for the inbound parse (I found information about the API for sending emails, but not for retrieving them). Is there a limit for attachments for inbound parse? (I use the free version)