Hi jhuynh05,
Thanks for using the Apple Support Communities.
We need help understanding the type of support that you're seeking.
When you have a free moment, please provide us with more information regarding the exact issue you're experiencing and what you'd like to accomplish, and we'll do our best to help you find a solution.
In the meantime, it seems that you might have a question about sending large attachments. Is that correct? If so, check out the link below.
Add an email attachment in Mail on iCloud.com - Apple Support
Turn on Mail Drop for large attachments
You can use Mail Drop to upload large attachments to iCloud, where they’re encrypted. Recipients see an attachment or a Mail Drop link in the message, and they can download the files for up to 30 days after they’re sent. See the Apple Support article Mail Drop limits.
1. In Mail on iCloud.com, click
at the top of the Mailboxes list, then choose Preferences.
2. Click Composing, then select “Use Mail Drop when sending large attachments.”
3. Click Done.
If the resource above has nothing to do with the type of support you're seeking, provide us specifics on what you are seeing and experiencing on your end for more help, and we'll continue from there.
Cheers!