Help me understand security of push notifications

With Surveillance Station, you can set up push notifications to send an email, text, or notification on mobile via DS Cam app.

I get the email service - you're authenticating yourself as the email account holder and sending an email. Do images transmit to Synology controlled servers before getting to your email inbox?

With push notifications to DS Cam, the same question. Are any images transmitted to any other servers before arriving on my phone?

These may be straightforward - but I was burned on the Eufy scandal and don't want a similar situation here.