@Renars: Which email app are you sending the email from? What happens when you attempt to send an email that is larger than 25mb? Do you get any error messages or notifications?
Gmail, as an example, has a 25mb limit for attachments which cannot be adjusted, so this may be true of other providers. If Gmail detects that you have exceeded the 25mb limit, it will add a Google Drive link to the email in place of the attachment(s).
@Renars: I'm not sure why your wife is able to exceed the 25mb attachment limit, unless the Google Drive link is kicking in, and she isn't aware of this. I think in this instance you might want to reach out to Google support directly to see if they're able to shed some light on this for you.
