The technical limitations of email sending services (SMTP) combined with the encoding and encryption we use, have led us to impose a limit of 10Mb on each file that can be attached to your messages.
However, there is a simple solution you can use if you want to share a file that is too large (Video, Audio or others):
If you have an online storage account (e.g. DropBox, OneDrive, iCloud, Mega...) you can keep the file on that storage account and share a link to that file inside an 3NCRYPT3D message. The recipient of this message can simply download it from your link.
Additional benefits: if you want to share multiple files, you can place all files in a folder and share the link to that folder.
The specific details of this operation will depend on the type of storage service you use, so you should be well familiar with it.