The thread I linked previously was what I used to get it working. I’ve gotten it to work for an on prem situation multiple times, only this time it was on cloud. However it still worked the same way, but not sure why it didn’t work the first time I tried. Note, if you’re following that guide, you should be getting a data “chunk”, not a filepath or link to the actual image.
On the other hand you can use a filepath I believe, but you’ll have to ensure that the agent user has access to that directory.