So how exactly is Ambient Dashboard getting the image right now? It shows up fine with the overlay included.
There is no weather data overlay from your current image at Ambientweather.net.
The image at Ambientweather.net only has date/time and the name "weather" underneath the date/time.
I tried URL and it never shows up. So I tried this and it uploads image but makes error.
If URL link doesn't work at Ambientweather.net then that would be a problem over at Ambientweather.net. You should ask them why they aren't pulling your URL.
How is it working then?
Your Meteobridge is uploading the raw image (no weather text overlay) via FTP to Ambientweather.net.
This configuration does just that. It hold the credentials for you to upload your camera image via FTP to Ambientweather.net (no weather text):
This other configuration is incorrect because you aren't using this feature correctly:
The purpose of the Event FTP Cam is to take the camera source image that the Meteobridge got via Weather Station / Weather Cam tab and then upload it to the path specified by "Path (File):" Therefore you are attempting to use this field as a source and its purpose is a destination on the remote FTP server whose credentials you defined by the Services / Service Settings tab.
The error you see if because that Path doesn't exist at Ambientweather.net FTP servers. It just isn't even formatted correctly to be a path anyway.
In the case of Ambientweather.net web cam FTP the path should just be blank. The purpose of this field is if you are FTP'ing to your own server and you want to specify a folder on your server that isn't the home folder for your FTP user account.