Can I change the attachment size limit in ticket comments?
It is not possible to increase the attachment size limits.
If you want to send files that exceed these limits, use another method. You can choose to host those files on another site and send the customer a hyperlink to the file or use a file-sharing app from our Marketplace such as the Box app.
For more information on attachments in tickets, see the article: Adding attachments to ticket comments.
For other related information, see this article: How many files can customers attach to a ticket through the web form?