Is There a File Size Limit?
Yes, you can add files up to 50mb, which should be plenty for most file types (such as images, PDFs, excel docs, word docs). Video files, however, might exceed this, so that's why we made sure you can also add videos using a link.
If you need to add a large video as an attachment, make sure your video is hosted elsewhere (Vimeo and YouTube are good places to start) and make a copy of the url. When you come to 'create asset' change the 'type of asset' to 'from link' then add a name and paste your url into 'asset link'. This will create an asset you can now select and add as an attachment.
When the user clicks on this link attachment, they will be taken straight to the video URL in their browser where they can view the video.