Invalid attachment file type Home › Forums › Front End PM PRO › Invalid attachment file type Search for: This topic is: Not Resolved This topic has 1 reply, 2 voices, and was last updated 3 years ago by shamim. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts November 12, 2019 at 10:09 pm #31073 Stuart IngramParticipant Hi, Quick question, how do I either remove the allowed file attachment types or add additional allowed types ? I need to be able to attached various CAD styles attachments to messages. Many thanks in advance. November 13, 2019 at 12:49 am #31083 shamimKeymaster You can try https://developer.wordpress.org/reference/hooks/upload_mimes/ Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You need to purchase ‘Front End PM PRO’ to create topic in this support forum. If you already purchased ‘Front End PM PRO’ please LOGIN.