Go to the attachment field's settings and find the option Maximum allowed files. RelatedHow to set a file size limit on the attachment field?How to restrict my form to only accept specific file types?Related ArticlesHow to restrict my form to only accepting specific file types?How to set a file size limit on the attachment field?How to change the attachment thumbnail size and fitHow to upload a file to an attachment field using a URL as the source?Features of the miniExtensions Starter Form