replacing Leaflet icon with a customised .png icon from json data import which is hosted on aws s3 storage

[Janine Roux]

I am new to Leaflet, as I am busy trying to migrate my Bing maps to a Leaflet environment. I have managed to customise a standard icon for a marker. 

However, as part of my async function which renders the positions, I have a .png image (which is already rotated and specific to a customer), which I would like to replace the icon with. This -tail- image is in the data as a .png file.

however, I am struggling to figure out exactly how to achieve this.

I am trying to include the .png's in both the popup and the latest position Marker... has anyone any idea how I can achieve this ? (my storage is in an aws s3 bucket).  I have tried many different options , the latest of which I have attached.