Embedding Image in Email Notification in NERM

I am looking to fix an issue where the end user receiving the email notification has issues sometimes with loading the image. The image included as a banner at the top of the template sometimes is received cut off, disproportioned, or not at all leaving a block of white space. I have seen solutions where the images need to be stored locally on clients system and have that path referenced. We are still using the OOTB email from NERM sent notifications. Any solutions formatting images with no issues in NERM?

try to use inline image rather a banner inside html table tag with width and height

This is what I am currently using as the first line of my template:
<img src="https://www.sample.org/-/media/images/sample/home/compressed-logos/logoumms.svg”>

I ran into a similar issue and what ended up fixing it was hosting it at the exact proportions needed, then using that URL in the HTML tag.

Just do embedded image data (base64) with data:image/ and call it a day.

I would say the best way is to host the image in a public/org level URL with required size and refer it in your HTML code.

you mean hosting the image on the clients server correct? to avoid firewall restrictions